question_answer

A particle of mass m moves in a circular path radius r under the action of a force\[\frac{m\,{{\upsilon }^{2}}}{r}\]. The work done during its motion over half of the circumference of the circular path will be

A) \[\left( \frac{m{{v}^{2}}}{r} \right)\times 2\pi r\]

B) \[\left( \frac{m{{v}^{2}}}{r} \right)\times \pi r\]

C) \[\left( \frac{2\pi r}{\frac{m{{v}^{2}}}{r}} \right)\]                               

D) zero