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20 May, 01:01

A weight lifter lifts a 300-N set of weights from ground level to a position over his head, a vertical distance of 2.15 m. How much work does the weight lifter do, assuming he moves the weights at constant speed

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  1. 20 May, 01:28
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    W = 645 J

    Explanation:

    The work done on an object is equal to the product of the force applied on the object and the distance through which it moves.

    W = F d

    where,

    W = Work Done

    F = Force

    d = Displacement

    In this case, the variables are as follows:

    F = Weight of Sets = 300 N

    d = vertical distance covered = 2.15 m

    Therefore,

    W = (300 N) (2.15 m)

    W = 645 J
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