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  • 4 years ago

Two guys, A and B are in tall building window cleaning 'elevators' that hang by a cable over the side of a building. The elevator is lifted up and down by the cable that is attached to a motor on the top of the building. Let's suppose (miraculously) that both the cable and the pulley over the side have no mass and that the pulley and motor operate without any frictional loss. (c) Somewhere around the third floor, at a height of 95 m above the ground, guy A drops his car keys. They fall with negligible air friction to the ground. What is the keys' speed as they hit the ground?

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