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Question

A box of 20 kg moves on a smooth horizontal surface with constant velocity. If the box has moved a distance of 4 metre then calculate the work done by the box.

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Solution

The expression for work done is as follows:
W=Fds
here, since the box is moving with a constant speed on a smooth surface so, the force force on the box is zero. Hence the work done by the box is zero.

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