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Question

# A boy is carrying a suitcase of 3kg mass on his back and moves 200m on a leveled road. If the value of g be 10m/s2 , the work done by the boy against the gravitational force will be:

A
6000J
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B
0J
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C
120J
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D
800J
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Solution

## The correct option is A 0JWork done against gravitational force W=mghwhere h is the vertical displacement of the suitcase.As the boy carries the suitcase on his back and moves on a leveled road, thus displacement of the boy (or the suitcase) in the vertical direction is zero i.e. h=0⟹ W=0J

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