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 against the gravitational force will be (g =10 m s-2) (a) 6 ×103 J (b) 6 J (c) 0.6 J (d) zero

Answer: (d) zero

Here Direction of work done is perpendicular to the gravitational force direction. Hence the work done against gravity is zero.

The amount of work done is expressed in the equation

Work done(W) = Force(F) × Distance(D)

Since the displacement is perpendicular to the applied force, the total work done is zero.

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