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A librarian is shelving books from a stacks cart that is 1.10 m high. If a particular book has a mass of 1.22 kg and

A librarian is shelving books from a "stacks" cart that is 1.10 m high. If a particular book has a mass of 1.22 kg and she wishes to place it on a shelf that is 1.85 m above the floor, determine the following.

(a) the amount of work the force of gravity does on the book

(b) the amount of work the librarian does on the book

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