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    eransaw's Avatar
    eransaw Posts: 1, Reputation: 1
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    #1

    Mar 4, 2012, 09:32 AM
    A 2-kg book is held 1 m above the floor for 50 s. The work done is what
    A 2-kg book is held 1 m above the floor for 50 s. The work done is what
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 6, 2012, 09:34 AM
    Work is equal to force times the distance the force acts over. In this case you have a force that you apply to hold up the book (that force is equal to the weight of the book), but since the book is stationary the distance the book moves is 0. So force times distance = 0.
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