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    dara1983 Posts: 1, Reputation: 1
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    Mar 10, 2010, 09:51 AM
    Work physics problems
    A child drags a 20kg box across a lawn for 11m and along a sidewalk for 40m; the coefficient of friction is 0.25 for the first part of the trip and 0.55 for the second. If the child always pulls horizontally, how much does the child do on the box?

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