A construction crew pulls up an 875-kg load using a rope, Ask an Expert

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A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 20.3 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant.

(a) How much work was done by the motor?

(b) How much work was done by gravity?

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