Question

(क) 'गतिविधिषु' इत्यत्र कः विभक्ति ?​

Answer 1

Answer:

Think of work done as a measure of displacement in the direction of force times force. If the displacement is perpendicular to the direction of force or if it is zero then work done is equal to zero. So work done by the sun on earth is zero since centripetal force is perpendicular to the motion of the earth.