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Work And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork And Energy2 Marks
Question
How much work is done by a Coolie to carry load on his head?
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Answer

Work done is zero because the force acting on load is in downward direction (weight due to gravity) and displacement is in horizontal direction.
So,
W = F.s cos90°
W = 0

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