A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a leveled road. The work done against the gravitational force will be ${g = 10 ms}^{- 2}$

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{6 \times 10}^{3}

6 J

0.6 J

Zero

answer is D.

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Detailed Solution

This is because while moving on a leveled road, a girl is doing the same amount of work against gravity as standing. Therefore the girl does work against the gravity is equal to the total weight she is carrying. Hence, the angle between the force and displacement is 90° that means the work done should be zero.

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