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प्रश्न
In the following case, work is done or not done and why?
A man standing in a lift and going up to nth floor.
लघु उत्तर
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उत्तर
Work is done on the man by the lift. The lift exerts an upward supporting force, and the man is displaced upward as the lift rises. Thus, the force and displacement are in the same direction, so the work done by the lift on him is positive.
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