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1. A horizontal moving walkway is moving at 3 m/s. On the average, during each second,...

1. A horizontal moving walkway is moving at 3 m/s. On the average, during each second, four stationary people step onto it and four people step off it. Assuming each person’s mass is 60 kg, what average driving force must be exerted on the walkway to keep it moving? (Ans: 720 N)

2. Blocks A and B are moving toward each other along the x-axis. A has a mass of 2.0 kg and a velocity of 50 [m/s], while B has a mass of 4.0 kg and a velocity of –25 m/s. They suffer an elastic collision and move off along the x-axis. Calculate the kinetic energy transferred from A to B during the collision. (Ans: 0)

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