A porter holds a heavy bag over his head for 10 min and get tired. Has he done work or not
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A person holds a bundle of hay over his head for 10 minutes and gets tired. He does no work in this situation. This is because the bundle of hay held by the person does not move at all.
i.e., displacement of bundle is zero.
i.e., Work, W = Force x Displacement = Force x 0 = 0.
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. Yes he had some work as the displacement of load is in direction force that is upward
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