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Negative Work

A man runs a ...

Question

A man runs a distance 'S' on a level road. The same man up a hill with the same velocity through the same distance. When does he do more work?

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Solution

Walking horizontally, man has to work against friction force of rough surface.

But walking on slope, man has to work against (friction force + gravitation force)

Hence, walking on slope required more work.

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