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Zero Work

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Question

A man weighing $50 kg$ is walking on a horizontal surface (assumed smooth) for a distance of $1 km$ . What is the work done by his weight?

A

Zero

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B

Positive

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C

Negative

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D

Nothing can be said

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Solution

The correct option is A Zero
The displacement and force of gravity are perpendicular to each other, so work done by his weight is zero.

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