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**Unformatted text preview: **of the book relative to the person ’ s head using the equation . Substitute 2.10 kg for , for , 2.20 m for and 1.60 m for . Thus, the potential energy of the book relative to the person ’ s head is . (c) The work done by the person to lift the book to a height above the ground is given by the equation . The height of the book above the ground is equal to . Rewrite the equation for work done. The work done by the person to lift the book is equal to the potential energy of the book when it is at height of 2.20 m above the ground. Thus, the work done by the person is related to the answer in part (a). http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=6pr30&id=489216 [2/4/2008 4:32:12 PM]...

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