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Work by Multiple Forces

A girl is car...

Question

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 be 10 m/s², the work done by the girl against the gravitational force will be :

(a) 6000 J
(b) 0.6 J
(c) 0 J
(d) 6 J

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Solution

The girl is moving with the bag on a levelled road. Her direction of motion is perpendicular to the direction of gravitational force. So, work done by the girl against gravity is zero. Therefore, the answer is 0 J
(c) 0 J

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