Work done by the normal reaction when a person climbs up the stairs is:

Positive

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Negative

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Zero

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None of these

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Solution

The correct option is A Positive
When the person is climbing up the stairs, he is applying force in downward direction and the normal reaction force is in the upward direction.Here the displacement is also in the upward direction.Hence the normal reaction and displacement is in the same direction, that means work done by the force is positive.

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