question_answer

A particle of mass m moves in a circular path radius r under the action of a force \[\frac{m{{v}_{2}}}{r}.\] The work done during its morion 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)  \[\frac{(2\pi r)}{\left( \frac{m{{v}^{2}}}{r} \right)}\]

D)  zero