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प्रश्न
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
उत्तर
The displacement of the man and suitcase is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 90°;
Thus, W = Fd cos 90° = 0
Hence, no work is done against gravity in this case.
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