If the cart starts at a height h1 = 10m, how much must the. What is its speed at the top of the loop? The values for Point can be put into the equation directly from your picture. roller coaster with weight requirement for a car, We've added a "Necessary cookies only" option to the cookie consent popup. Include a free-body diagram in your solution. A computer disk starts from rest at timeti=0 and accelerates uniformly for 0.500 s to, Q:2. 0 + mghA = 0 + mghD - Wnc Find the tension in each of the three cables supporting the traffic light if it weighs 2.00 102N. Three forces act on an object, considered to be a particle, which moves with constant velocityv=(3i2j)m/s.v=(3i^2j^)m/s. For larger objects (such as a baseball) moving at a velocity in air, the drag force is determined using the drag coefficient (typical values are given in. (a) Find the acceleration of the system. N B) 12.5 N C) 25.0 N D) 50.0 N The acceleration due to gravity on the surtacc of planet X is 19.6 meters per second2 If an object on the surface of this planet weighs 980. newtons, the mass of the object is A) 100. kg B) 50.0 kg C) 490. Answer the same question for a body sliding down a curved surface. Given data- O+ Qualitative By=1.2 T, Q:A car speeds up uniformly from 10 m/s to 20 m/s while traveling a A student is attempting to move a 30-kg mini-fridge into her dorm room. It's going to vary from coaster to coaster, and car to car. No. A:Given data- Still others may write it as KE1 + PE1 + Eadded to the system = KE2 + PE2 + Eleaving the system. Others use P.E. The height of the Consider the 52.0-kg mountain climber shown below. (a) What is the force of the car seat on the child at point A? An object with massmmoves along thex-axis. An airplane flying at 200.0 m/s makes a turn that takes 4.0 min. Railroad tracks follow a circular curve of radius 500.0 m and are banked at an angle of5.05.0. How does Charle's law relate to breathing? A 0.500-kg potato is fired at an angle of80.080.0above the horizontal from a PVC pipe used as a potato gun and reaches a height of 110.0 m. (a) Neglecting air resistance, calculate the potatos velocity when it leaves the gun. Suppose a mass is moving in a circular path on a frictionless table as shown below. it is also assumed that there is no loss of energy due to air friction. 10 To do this, he lowers his body 0.300 m and then accelerates through this distance by forcefully straightening his legs. This is an inertial force sensed and used by the riders to explain events in the rotating frame of reference of the barrel. What is the ideal speed to take a 100.0-m-radius curve banked at a20.020.0angle? Assume the child is not holding on and does not wear a seat belt. the initial height 54.0 m is great enough so that the car never loses contact (a) The elevator accelerates upward from rest at a rate of1.20m/s21.20m/s2for 1.50 s. Calculate the tension in the cable supporting the elevator. It gets the cars up to the top, and the speed of the cars is very small during the lifting process and at the top. How much do the roller coaster carts weigh? Draw the free body diagrams for the car going around a horizontal curve, the bottom of a vertical loop, and the top of a vertical loop in which the cart is upside down. Seriously, I would not trust rides like that. a lot. Intamin Hyper train? When a body slides down an inclined plane, does the work of friction depend on the bodys initial speed? (a) On dry concrete. The normal force on each rider follows the same rule. B&M sit down, or stand up, or inverted? The magnitude of static friction force between two materials stationary relative to each other is determined using the coefficient of static friction, which depends on both materials. The chain return is now usually located inside the spine of the track rather than a separate component. (a) At what angular velocity is the centripetal acceleration 10gif the rider is 15.0 m from the center of rotation? Free shipping for many products! Find the magnitude and direction of the total force on the Achilles tendon. B. How far is the spring stretched? (c) What is the average force on the shell in the mortar? > coaster carriage weighs? With what minimum speed must they begin their swing? This makes physical sensethe force required to stop the roller-coaster depends on its mass. This form of the equation works equally well for the first part of the problem (where Wnc = 0) and for the second question (where you need to solve for Wnc.). Consider a particle on which several forces act, one of which is known to be constant in time: . A car rounds a curve and encounters a patch of ice with a very low coefficient of kinetic fiction. In this problem, you are first asked to find how fast a roller-coaster moves at a given point on the track. > philadelphia tobbogan train cars weigh on average 800#'S FOR WOODEN COASTERS, > Hi, does anyone have any idea how much the average roller Dont I need to know the coefficient of friction to solve for stopping force? At what anglebelow the horizontal will the cage hang when the centripetal acceleration is 10g? How to react to a students panic attack in an oral exam? Some books teach you to always think about this term, others only add it if it isnt zero. The coefficient of friction betweenm1m1and the inclined surface isk=0.40.k=0.40. and, --------------------------------- At any point #x# Use P.E. What causes water to be removed from clothes in a spin-dryer? It then drops 46 m before climbing 28 m to the top of the second hill. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. (c) Which premises are unreasonable or inconsistent? When the car takes a turn, the track must be able to supply a force $F_c$ known as the centripetal force in order to keep the car on the track: $\large{F_c=\frac{mv^2}{R}}$, where $R$ is the radius of the bend. How much does an average roller coaster cart weigh? To be stable, the force exerted by the ground must be on a line going through the center of gravity. (b) Will a metal cabinet lying on the wooden bed of the truck slip if it accelerates at this rate? Indicate the direction of the acceleration on each diagram. Anna says a satellite in orbit is in free fall because the satellite keeps falling toward Earth. The mass of the block on the table is 4.0 kg and the hanging mass is 1.0 kg. The values for Point D can be put into the equation directly from your picture. Angle of inclination for M1 is Two blocks are connected by a massless rope as shown below. You may use the result of the previous problem. (a) Calculate the acceleration of a box heading down a10.010.0slope, assuming the coefficient of friction for a parcel on waxed wood is 0.100. General Physics Using Calculus I by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted. On average, these carts can weight between 600 and about 1000 pounds each. Neglecting frictional losses, what is the expected speed of the coaster as it passes over the top of the As you can see, the mass of car (and riders) $m$ does play part here but again it seems folly to rely on loading specifications rather than safe design. Do you mean a Corolla or an SUV? Otherwise you're looking at weights anywhere from the hundreds of pounds into the thousands of pounds for each car, depending on which coaster. Displacement (d) is to the right in this drawing and stopping force is to the left, so the angle between them is 1800. b) How hard does it press against the track at point B. Explain how this allows the curve to be taken at the greatest speed. Draw the side view of your roller coaster on graph paper. Be sure to draw diagrams, resolve all force vectors into horizontal and vertical components, and draw a free-body diagram. The mass of an electron is9.111031kg9.111031kg. Calculate for a car: (a) On dry concrete. at the best online prices at eBay! The energy conversion chain for this motion is, gravitational potential energykinetic energy + gravitational potential energy. Given also is that initial velocity is towards the #x# axis only. Car can go only up to initial height #h#, 59739 views First week only $4.99! asked by Heylee Green November 30, 2020 1 answer (c) If it actually starts 5.00 m higher than your answer to (b), how much energy did it lose to friction? AL Two of the forces areF1=(3i+5j6k)NF1=(3i^+5j^6k^)NandF2=(4i7j+2k)N.F2=(4i^7j^+2k^)N.Find the third force. Two expressions were used for the drag force experienced by a moving object in a liquid. The pulley and all surfaces are frictionless. The mass of the front barge is2.00103kg2.00103kgand the mass of the rear barge is3.00103kg.3.00103kg. C. What speed does the car need at the top of a loop with a radius of 4.5 m in order for the car to experience weightlessness? for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A 2. Repeat the preceding problem for a car with four-wheel drive. The dogs have average masses of 19.0 kg, and the loaded sled with its rider has a mass of 210 kg. And what kind of steel coaster are you wanting? F = 4200 N, In the second part of the problem, you are asked to find the force required to stop the roller-coaster between Points C and D. The energy chain for this motion is. (Ignore rolling.) (a) Calculate the ideal speed to take a 100.0 m radius curve banked at15.015.0. Mass of the first block is WebIn this case, the force of gravity can be determined from the equation Fgrav = m g. Using a g value of 9.8 m/s 2, the force of gravity acting upon the 864-kg car is approximately 8467 N. Step 5 of the suggested method would be used if the acceleration were not given. The wheels become locked (stop rolling), and the resulting skid marks are 32.0 meters long. A 2.00 kg block (mass 1) and a 4.00 kg block (mass 2) are connected by a light string as shown; the inclination of the ramp is40.040.0. The normal force on an object is not always equal in magnitude to the weight of the object. (a) What is the radius of a bobsled turn banked at75.075.0and taken at 30.0 m/s, assuming it is ideally banked? Given: radius of circular motion = R = 18 m weight of passengers = w apparent weight of passengers = N = 50%w Asked: then at 5 meters up The weight of roller coaster The coefficient of friction is80%80%of that for the static case. Each cart rolls freely with negligible friction. distance of 75 m. What is its, Q:Show and explain your work, the other solutions showed by one of your expert didnt help me., Q:The ammeter shown in the figure below reads 2.20 A. Estimate its terminal velocity. All that matters for describing motion and energy is that you explicitly state where your reference point is. P Considering only the #y# component of velocity of the car. How much do the roller coaster carts weigh? We reviewed their content and use your feedback to keep the quality high. The weight of roller coaster carts varies greatly with the roller coaster style. The glue on a piece of tape can exert forces. This player leaves the floor with a vertical velocity sufficient to carry him 0.900 m above the floor. A box rests on the (horizontal) back of a truck. Many amusement parks have rides that make vertical loops like the one shown below. WebThe current coasters have these weight limits based on the manufacturer requirements: SFA: Batwing256 pounds Since only one coaster has an official weight limit, then this does not mean that those with very a large weight can ride. c=1.8i^+2.8j^+4.6k^ (b) The riders cage hangs on a pivot at the end of the arm, allowing it to swing outward during rotation as shown in the bottom accompanying figure. (d) If the elevator had no brakes and the cable supporting it were to break loose so that the elevator could fall freely, what would the spring scale read? How do you find density in the ideal gas law. rev2023.3.3.43278. (b) Find the velocity of the box as it reaches the end of the plane, if the length of the plane is 2 m and the box starts at rest. 12.A system, A:as per bartebley Q.A guideline I have answer first three part .remaining part of question.Please. (b) Calculatefor a 12.0-m/s turn of radius 30.0 m (as in a race). Since the work of the gravitational force mg is path Independent, what did the King of the Apes gain in using stairs? What bank angle is required? What is the total mechanical energy of the roller coaster cart at point A? (b) What is unreasonable about the result? Is there a specific type of coaster that you're wondering about? White light is capable, A:To answer > coaster carriage weighs? a force of 50 lbf. (d) #41 m#. It only takes a minute to sign up. WebFind many great new & used options and get the best deals for LEGO FRIENDS: Amusement Park Roller Coaster (41130) Complete Boxed Retired! An external force is applied to the top block at an anglewith the horizontal. 7.000 Can any combination of forces be a centripetal force? At Point B, part of the gravitational potential energy of the roller-coaster has been converted to kinetic energy, and the roller-coaster has a speed of 30 m/s. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. (850 kg)(9.8 m/s2)(140 m) = (850 kg)(9.8 m/s2)(80. m) F(120 m)cos(1800) Two blocks connected by a string are pulled across a horizontal surface by a force applied to one of the blocks, as shown below. The contestant now pulls the block of ice with a rope over his shoulder at the same angle above the horizontal as shown below. More than a bread box. (I'm bored today. Pardon.) Can these forces be a type of simple friction? KE A + PE A = KE D + PE D - W nc 0 + mgh A = 0 + mgh D - W nc (850 kg)(9.8 m/s 2)(140 m) = (850 kg)(9.8 m/s Average Weight of a Roller Coaster Cart in Kg Pe_Emery.Brandt.286 April 26, 2022 A Roller Coaster Vehicle Has A Mass Of 500 Kg When Fully Loaded With Passengers A If The Vehicle Youtube Neglect air resistance. The values for Point A can be put into the equation directly from your picture. Watch the mass inside the tube carefully, (1 kg = 2.2 lbs.) Is that trail straight, curved to the left, or curved to the right? If you wish to reduce the stress (which is related to centripetal force) on high-speed tires, would you use large- or small-diameter tires? The rotational velocity is 200.0 cm/s. Those will also be different than the wide variety of different steel coaster trains, as will the Gerstlauer wood coaster trains and cars. It is at rest and in equilibrium. Assume there is no friction or air resistance between Points A and C. How fast is the roller-coaster moving at Point B? When a body of mass 0.25 kg is attached to a vertical massless spring, it is extended 5.0 cm from its unstretched length of 4.0 cm. (b) Find the tension in the rope. WebFind many great new & used options and get the best deals for LEGO FRIENDS: Amusement Park Roller Coaster (41130) Complete Boxed Retired! If each block has an acceleration of2.0m/s22.0m/s2to the right, what is the magnitudeFof the applied force? The radius of the curve is 310 m. What is the angle of banking of the highway? (The speed of light isv=3.00108m/s.v=3.00108m/s.) By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Race car drivers routinely cut corners, as shown below (Path 2). A 35.0-kg dolphin decelerates from 12.0 to 7.50 m/s in 2.30 s to join another dolphin in play. slides along a frictionless track. (c) Determined2r/dt2d2r/dt2and show thatais given byac=r2.ac=r2. (b) On wet concrete. The barrel is spun up and the floor drops away. Many cars are roughly a ton. Both wood and steal. While some can be, most are powered with gravity. 6. and others use U. Using concepts related to centripetal force and Newtons third law, explain what force stretches the string, identifying its physical origin. A 60.0-kg and a 90.0-kg skydiver jump from an airplane at an altitude of6.00103m6.00103m, both falling in the pike position. Express your answer in newtons and as a ratio to the weight of the potato. WF = Fd cos. If the cart starts at a height h1 = 10m, how much must the, At the top of its drop hill, a 1,000 kg roller coaster has 200,000 J of total energy. A:If an observer observe an object, it is due to observer received some light from the object. m, William Moebs, Samuel J. Ling, Jeff Sanny, (Figure 1) A roller-coaster car may be represented by a block of mass 50.0 kg. If the top of the next hill is 13 meters, what is the kinetic energy of the roller coaster on this hill? Intamin (older) cars were quite heavy around 2800 each and (newer) around 2500 each. (a) Calculate the minimum coefficient of friction needed for a car to negotiate an unbanked 50.0 m radius curve at 30.0 m/s. If the particle is fired vertically with velocityv0v0from Earths surface, determine its velocity as a function of positionr. (Hint:useadr=vdv,adr=vdv,the rearrangement mentioned in the text. Assume that only half the weight of the car is supported by the two drive wheels and that the coefficient of static friction is involvedthat is, the tires are not allowed to slip during the acceleration. All are equivalent and refer to the same thing. Explain. (Velocity and Acceleration of a Tennis Ball). The kinetic friction force between two materials moving relative to each other is determined using the coefficient of kinetic friction, which also depends on both materials and is always less than the coefficient of static friction. d M (d) How high will the car go on the last hill ? What magnitude force must act up and parallel to the incline for the bin to move down the incline at constant velocity? (a) current, Q:A uniform electric field of magnitude 5.9x105 N/C points in the positive Draw the free body diagrams for the car going around a horizontal curve, the bottom of a vertical loop, and the top of a vertical loop in which the cart is upside down. This means energy can be compared at any two points. (a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary. The roller-coaster track includes a circular loop of radius R in a vertical plane. Again, what do you call a "normal" car? The coefficient of static friction between the tires and the wall is 0.68. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? A limit involving the quotient of two sums, Short story taking place on a toroidal planet or moon involving flying. (c) Which premise is unreasonable, or which premises are inconsistent? (Ignore rolling.) At what angle relative to the vertical does the plumb bob hang? As shown below, the mass of block 1 ism1=4.0kg,m1=4.0kg,while the mass of block 2 ism2=8.0kg.m2=8.0kg. (a) What is x? A banked highway is designed for traffic moving at 90.0 km/h. We can determine the, Q:o, what formula do you apply to get 16 m ? :). = 5 9.81 * 5 Joules. WebThings You Should Know About Roller Coasters Vertical Drops: Roller coasters almost always begin with an initial vertical drop. A small space probe is released from a spaceship. (a) When rebuilding his cars engine, a physics major must exert3.001023.00102N of force to insert a dry steel piston into a steel cylinder. A constant resultant force of(2.0i+4.0j)N(2.0i^+4.0j^)Nthen acts on the object for 3.0 s. What is the magnitude of the objects velocity at the end of the 3.0-s interval? Only two significant figures were given in the text of the problem, so only two significant figures are included in the solution. The force of The result of the preceding problem may be useful, but be careful to consider the fact that the snow boarder is going uphill. My two kids in a car on their own would not be enough weight, it was said. Consider the 65.0-kg ice skater being pushed by two others shown below. Can someone briefly sketch the equations here? About yea much, give or take. Because there is no friction over this portion of the track, the only energy conversion that takes place is between kinetic energy and gravitational potential energy. A skydiver is at an altitude of 1520 m. After 10.0 seconds of free fall, he opens his parachute and finds that the air resistance,FDFD, is given by the formulaFD=bv,FD=bv,wherebis a constant andvis the velocity. The radius of the orbit is5.281011m,5.281011m,and the speed of the electron is2.18106m/s.2.18106m/s. 1 of 1 View Available Hint(s) K= Submit Part B for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A hmin Find the minimum initial height hminat which the car can be released that still allows the car to stay in contact with the track at the top of the loop. Located at the origin, an electric car of massmis at rest and in equilibrium. In this case, the non-conservative force is the stopping force. Also use g = 10 m/s2. I was using the, A:for t = 4 sec A block of mass 0.500 kg is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x (Fig. direction. Assume the child is not holding on and does not wear a seat belt. In that case. (Figure 1)A roller-coaster car may be represented by a block of mass 50.0 kg . A 30.0-g ball at the end of a string is swung in a vertical circle with a radius of 25.0 cm. r=a-b+c, Q:8. and ? Express your answer numerically, in joules. a=3.90 cm , b=2 a=7.8 cm , c=2.4 a=9.36 cm. As shown below, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. (a) Calculate the acceleration of the dogs starting from rest if each dog exerts an average force of 185 N backward on the snow. Why can a squirrel jump from a tree branch to the ground and run away undamaged, while a human could break a bone in such a fall? A. KE = 500kg 9.81 m s 30m. Webyour cart at the top of your coaster. Some books use PE for potential energy. If the coefficient of kinetic friction between tires and road is 0.550, and the acceleration was constant during braking, how fast was the car going when the wheels became locked? Why is there a voltage on my HDMI and coaxial cables? = mgh where m is the mass of your cart in grams, h is the height of your track and g=9.8 N/kg to calculate the potential energy. Express your answer numerically, in meters. Find the acceleration of the block. Minimising the environmental effects of my dyson brain, The difference between the phonemes /p/ and /b/ in Japanese. It takes 12 s to fall a distance of 0.60 m. Calculate the viscosity of the oil. Suppose that the resistive force of the air on a skydiver can be approximated byf=bv2.f=bv2. The mass of the roller coaster below is 80 kg. If L=6 H, determine R. Plate Area A = 30 cm = 30 10-4m (a) With what minimum speed must Jane begin her swing to just make it to the other side? Find the tension in the string: (a) at the top of the circle, (b) at the bottom of the circle, and (c) at a distance of 12.5 cm from the center of the circle(r=12.5cm).(r=12.5cm). (e) Once the block begins to slide downward, what upward force on the rope is required to keep the block from accelerating downward? What is the normal force between the piston and cylinder? (Use a drag coefficient for a horizontal skydiver.) All surfaces are frictionless. It then drops 46 m before climbing 28 m to the top of the second hill. During its fall, how much work is done on the mouse by air resistance? Find the terminal velocity of a spherical bacterium (diameter2.00m2.00m) falling in water. Mass is present in all terms of the equation, and so it can be divided out. each. The table and the pulley are frictionless. Explain. KEA + PEA = KED + PED - Wnc A 30.0-kg girl in a swing is pushed to one side and held at rest by a horizontal forceFFso that the swing ropes are30.030.0with respect to the vertical. Calculate the average acceleration of the potato in the tube as it goes from zero to the velocity found in (a). Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be ignored. (b) Find the angle of the slope down which this box could move at a constant velocity. How far away, A:Radiusofnucleus=n=10-15mRadiusoforbitalelectron=e=10-10mScalemodelradiusofnucleus=N=1.4, Q:Determine the time constant of the LR circuit. (a) If the force is 33 N, what is the horizontal acceleration of the sled? (Drag area is0.70m20.70m2) (b) What is the drag force at 70 km/h and 100 km/h for a Hummer H2? (b) Calculate the force in the coupling between the dogs and the sled. A massless rope to which a force can be applied parallel to the surface is attached to the crate and leads to the top of the incline. How do you calculate the ideal gas law constant? The CERN particle accelerator is circular with a circumference of 7.0 km. A half-full recycling bin has mass 3.0 kg and is pushed up a40.040.0incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What is (a) the acceleration of each block and (b) the tension in the string? Has 90% of ice around Antarctica disappeared in less than a decade? > just a thought An 850 kg roller-coaster is released from rest at Point A of the track shown in the figure. (Energy does not require dividing vectors into components, or doing Second Law problems to find acceleration.) Friction is a contact force that opposes the motion or attempted motion between two systems. The car encounters a loop of radius R = 18.0 m at ground level, as shown. The tallest lift hills on coasters today use arch shape support strategies to minimize the amount of structure needed. A roller-coaster car shown in Figure P7.82 is released from rest from a height h and then moves freely with negligible friction. A car is moving at high speed along a highway when the driver makes an emergency braking. Find the potential energy of a particle subjected to this force when the particle is at a distance D from P, assuming the potential energy to be zero when the particle is at P. Check Your Understanding suppose the radius of the loop-the-loop in Example 7.9 is 15 cm and the toy car starts from rest at a height of 45 cm above the bottom. (b) How far does he travel? You can apply concepts from kinematics and dynamics to solve these problems. The value of 30 m/s is reasonable for motion of a roller-coaster. Once it begins to move, what is its acceleration and what reduced force is necessary to keep it moving upward at constant speed? 250 pF has a charge of magnitude 0.146 C on, Q:d) What is the magnitude and direction of Vem i? The height of the car at point 725 is the minimum height that is necessary for the car to stay on the loop. Mass cannot be divided out of this equation because it does not appear in all terms. >. What's New ok so how much does a normal car weigh in comparison to a rollercoaster carriage? 1=45.5 ), Show that the acceleration of any object down a frictionless incline that makes an anglewith the horizontal isa=gsina=gsin. To maintain a constant speed, the force provided by a cars engine must equal the drag force plus the force of friction of the road (the rolling resistance). (a) What is the speed of the roller coaster at the top of the loop if the radius of curvature there is 15.0 m and the downward acceleration of the car is 1.50g? Free shipping for many products! (a) What is the final velocity of a car originally traveling at 50.0 km/h that decelerates at a rate of0.400m/s20.400m/s2for 50.0 s? The terminal speed is observed to be 2.00 cm/s. In this instance, the acceleration is known. The lunch box leaves a trail in the dust on the merry-go-round. the bottom,, Q:a) Calculate the height of a cliff if it takes 2.56 s for a rock to hit the ground when it is thrown, Q:What are (a) the x component, (b) they component, and (c) the z component of 7 = b + c if =, A:It is given that, Asking for help, clarification, or responding to other answers. The car encounters a loop of radius R = 18.0 Assume all values are accurate to three significant digits. Making statements based on opinion; back them up with references or personal experience. The Law Energy Conservation tells us that: $T=K+U$, with $T$ the Total Energy of the car (and riders). Webto the floor of the roller coaster at all times, allowing the mass to move up and down in the tube freely.) A large rocket has a mass of2.00106kg2.00106kgat takeoff, and its engines produce a thrust of3.50107N.3.50107N. There are many description of motion problems which can be solved by either kinematics or energy. (b) Calculate the magnitude ofF.F. #half of initial #PE # has got converted into #KE # of the car A basketball player jumps straight up for a ball. Two friends are having a conversation.
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