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Work, Energy and Power — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsWork, Energy and Power2 Marks
Question
How much work is done by a coolie walking on a horizontal platform with a load on his head? Explain.
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Answer

W = 0 as his displacement is along the horizontal direction and in order to balance the load on his head, he applies a force on it in the upward direction equal to its weight. Thus angle between force and displacement is zero.

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