A man with a box on his head is climbing up a ladder. What work is said to be done by the man on the box?

Positive

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Negative

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Zero

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Undefined

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Solution

The correct option is A Positive
When man is climbing up a ladder by keeping box in hand, its mean that Box is also moving up. During upward movement of Box, man will apply constant force on the Box in upward direction which is just greater then the weight of Box.
Because Direction of force on the box and direction of displacement of box is in same direction, So Work done by man on the box will be positive.

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