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Question

A girl is carrying a school bag 3 kg on her back and moves 200 m on a leveled road. The work done against the gravitational force will be (g=10 ms2)

A
6×103 J
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B
6 J
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C
0.6 J
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D
0 J
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Solution

The correct option is D 0 J
The height of the bag from the ground always remains constant throughout the journey.
s=0
W=Fs
W=0 J
hence the work done against the gravitational force will be zero.

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