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A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is 1) FC/2 2) FC 3) F/C 4) Zero.
The work done is given by W = F S cos ø where F is the force, S is the displacement and ø is the angle between the force and displacement. Here the angle between the force and the displacement is 90o. Hence the work done is zero
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