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Question

A body of mass $$100 g$$ is rotating in a circular path of radius $$r$$ with constant velocity. The work done in one complete revolution is:


A
r100J
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B
100rJ
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C
100r
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D
zero
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Solution

The correct option is D zero
We know that total work done is equals to change in kinetic energy plus change in potential energy. 

Kinetic energy-
In this case there is no change in the velocity so change in kinetic energy is zero. 

Potential energy-
There is no change in the height of the object hence change in potential energy is also zero.

So there is no work donw on the body.


Physics

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