if a person lift a bag at some height and he is at rest how much work is done by him
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no work as he was resting
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The work done by the man is zero, technically.
Explanation:
Work done by the body is the product of the force applied to the body and the displacement done.
W = F d
According to the theory, if force is exerted, the body should be in motion. As the person stood still in the same place, displacement d=0
W = F*0 = 0 units.
Therefore, no work is done by the person according to the work-displacement theory.
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