Question
No work is done on a suitcase if a man holding it walks on a horizontal platform ?
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Answer
When a man is walking holding a suitcase, the suitcase moves. But the force applied (force of gravity) on the suitcase is in the vertically upward direction (against the gravity), whereas the displacement is in the horizontal direction on platform. A vertical force can never cause a horizontal displacement. So the displacement of the suitcase is not due to the force acting on it. Therefore, no work is done.
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