Assume that before the accident happened, the car was going at a constant velocity of 60Km/h on a level highway for a distance of 10.0km. The car accelerated briefly to 70.0Km/h to pass another car and then returns to 60.0Km/h as it descends the other side of the hill, even though the driver has taken her foot off the accelerator. Identify the times when the car’s engine was doing work on the car. Explain your answers.

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A: Kinematics.

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A: KEBottom-KEtop=PE0.5mvbottom2-0.5mvtop2=mghh=0.vbottom2-0.5vtop2g

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A: Initial speed u = 34.4 m/s Final speed v = 32.0 m/s Maximum height = h

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A: Draw the free-body diagram of the piano.

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Q: Boxes A and B in (Figure 1) have masses of 12.0 kg and 5.0 kg, respectively. The two boxes are…

A: Given mass of box A=mA=12kg           mass of box B=mB=5kg.

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A: Initial velocity (V°) = 34.6 m)/s Final velocity (Vf) =33 m/s

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Q: What happens to the velocity of the cart from position A to D?

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A: This problem is related to conservation of energy.

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A: (a) The change in kinetic energy is the work done. that is,…

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