Consider a planet moving in an elliptical orbit round the sun. The work done on the planet by the gravitational force of the sun
A
is zero in any small part of the orbit.
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B
is zero in some parts of the orbit.
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C
is zero in one complete revolution.
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D
is zero in no part of the motion.
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Solution
The correct option is B is zero in some parts of the orbit. The work done is zero at points A and B, since the force acts along the AB axis and the motion is perpendicular to it(W=|F||S|cosθ)