You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as it drops to her hands? (b) What is the change ΔU in the gravitational potential energy of the book-Earth system during the drop?

asked by Ariana

11 years ago

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2 answers

work=force*distance =mg*(12-1.4)

change PE=mgh

answered by bobpursley

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answered by Anonymous

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Question

You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as it drops to her hands? (b) What is the change ΔU in the gravitational potential energy of the book-Earth system during the drop?

2 answers

work=force*distance =mg*(12-1.4)

change PE=mgh

1561

Ask a New Question or answer this question.

bobpursley · Answer

work=force*distance =mg*(12-1.4) change PE=mgh

Anonymous · Answer

1561