ch07-p024 - 24. We use d to denote the magnitude of the...

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24. We use d to denote the magnitude of the spelunker’s displacement during each stage. The mass of the spelunker is m = 80.0 kg. The work done by the lifting force is denoted W i where i = 1, 2, 3 for the three stages. We apply the work-energy theorem, Eq. 17-15. (a) For stage 1, Wm g d K m v v 11 1 2 1 2 1 500 −== = Δ ,. where m / s. This gives 22 2 3 (80.0 kg)(9.80 m/s )(10.0 m) (80.0 kg)(5.00 m/s)
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