A boy carrying a box on his head is walking on a level road from one place to another. The work done by him against the gravitational force is zero. This statement is :

correct

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incorrect

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partly correct

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insufficient data

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Solution

The correct option is C correct
Gravitational force on the box is acting in the downward direction. Since the boy walks horizontally, his vertical displacement is zero. Hence, when a boy carrying load on his head moves over a horizontal road, work done against gravitational force is zero.

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