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13 October, 09:32

A 35-N bucket of water is lifted vertically 3.0m and then returned to its original position. How much work did gravity do on the bucket during this process? (a) 180J (b) 90J (c) 45J (d) 0J (e) 900J

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  1. 13 October, 12:56
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    Work done, W = 0 J

    Explanation:

    It is given that,

    Weight of the bucket, W = F = 35 N

    It is lifted vertically 3 m and then returned to its original position. We need to find the work gravity do on the bucket during this process.

    Work done when the bucket is lifted vertically, W₁ = - mgh

    Work done when the bucket returned to its original position, W₂ = + mgh

    Net work done, W = W₁ + W₂

    W = 0 J

    So, the work done on the bucket is zero. Hence, this is the required solution.
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