A girl is carrying a school bag of $3 kg$ mass on her back and moves $200 m$ on a levelled road. If the value of $g$ is $10 m / s^{2}$ , the work done by the girl against the gravitational force will be__

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6000 J

600 J

6 J

0 J

answer is D.

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Detailed Solution

When a girl is carrying a school bag of

3 kg

mass on her back and moves

200 m

on a levelled road, the work done by her against gravitational force is

0 J

The gravitational force is acting vertically downwards. As the directions of force and displacement are perpendicular to each other, the work done by the girl against the gravitational force will be zero.

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