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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.


Solution

The expression for work done is as follows:
$$W=\int{F \cdot ds}$$ 
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.  

Physics

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