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More Than One Correct Answer Type Q19 A man of mass m standing at the...

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More Than One Correct Answer Type Q19 A man of mass m standing at the bottom of the staircase of height L climbs it and stands at its top a Work done by all forces on man is equal to the rise in potential energy mgl b Work done by all forces on man is zero c Work done by the gravitational force on man is mgl d The reaction force from a step does not do work because the point of application of the force does not move while the force exists Sal b d When a man of mass m climbs up the staircase of height L work done by the gravitational force

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