A cave rescue team lifts an injured spelunker directly, Ask an Expert

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A cave rescue team lifts an injured spelunker directly upward andout of a sinkhole by means of a motor-driven cable. The lift isperformed in three stages, each requiring a vertical distance of15.0 m: (a) the initially stationaryspelunker is accelerated to a speed of 3.30m/s; (b) he is then lifted at theconstant speed of 3.30 m/s; (c) finallyhe is decelerated to zero speed. How much work is done on the 82.0kg rescue by the force lifting him during each stage?

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