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August 31, 2015

Homework Help: physics

Posted by dawn on Wednesday, February 13, 2008 at 4:42pm.

A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 7.70 m: (a) the initially stationary spelunker is accelerated to a speed of 3.80 m/s; (b) he is then lifted at the constant speed of 3.80 m/s; (c) finally he is decelerated to zero speed. How much work is done on the 62.0 kg rescue by the force lifting him during each stage?

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