You drop a 2.00 kg book to a friend who stands on the ground at distance D 10.0 m below

Chapter 8, Problem 3

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You drop a 2.00 kg book to a friend who stands on the ground at distance D 10.0 m below. If your friends outstretched hands are at distance d 1.50 m above the ground (Fig. 8-30), (a) how much work Wg does the gravitational force do on the book as it drops to her hands? (b) What is the change U in the gravitational potential energy of the bookEarth system during the drop? If the gravitational potential energy U of that system is taken to be zero at ground level, what is U (c) when the book is released and (d) when it reaches her hands? Now take U to be 100 J at ground level and again find (e) Wg, (f) U, (g) U at the release point, and (h) U at her hands. DFigure 8-30 3 and 10.