Question

A particle is moving in a circular path of radius r under the action of a force F. If at an instant velocity of particle is v, and speed of particle is increasing, then  

(i) F.v=0    (ii) F.v > 0   (iii) F.v < 0

Joshi sir comment

centripetal acc. is the need for circular motion but speed is increasing so tangential acc will also be present so angle between velocity and acc will be acute so F.v > 0

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