Question: An elevator might be raised and lowered directly by a winch, as in Figure P7.9a, or the mechanism might include a counterweight that moves up

An elevator might be raised and lowered directly by a winch, as in Figure P7.9a, or the mechanism might include a counterweight that moves up when the elevator moves down, as in Figure P7.9b. In which case is the change in the gravitational potential energy of the Earthelevator-winch system lower?

Data from Figure P7.9

(a) (b)

(a) (b)

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