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ten bricks each 6.0cm thick and mass of 1.5kg, lie on a table, how much work is required to stack them one on the top of another?
A. 40j
B. 88j
C. 45j
D. 0j
E. None of these

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  1. original height of center of mass = 3 cm
    final height of center of mass = 5^6 = 30cm
    change in height of GC = 30-3 = 27 cm=.27m
    work = m g h = 15 * 9.8 * .27 = 39.69 or 40 J so A

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    posted by Damon

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