Question

You drop a 2.00 kg book to a friend who stands on the ground at distance D= 10.0 m below. If your friend’s outstretched hands are at distance d=1.50 m above the ground see the next figure, (a) how much work W_g 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 book–Earth 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?

Answer 1

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