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Moon revolves around the earth due to gravitational force $(F)$ of earth on moon. The work done by the gravitational force is $(r=radius\ of\ circular\ orbit\ of\ moon)$:- $F.2\pi r$
- $F.\pi r$
- zero
- negative work
The moon revolves around the earth due to the gravitational force $(F)$ of the earth on the moon. The work done by the gravitational force is zero because the direction of the displacement $(motion)$ is perpendicular to the direction of the gravitational force of the earth. And we know work done $W=Fd\cos\theta$, here $\theta=90^{\circ}$, and $\cos90^{\circ}=0$.. so $W=0$.
Therefore, option c). is correct.
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