$A$ body of mass $m$ moves in a circle of radius $r$ with a constant speed $V$. $A$ force of $mV^2/r$ acts towards the center of the circle. Find the work done by this force when the body covers half the circumference of the circle.
- A$(mV^2/r) \pi r$
- BZero
- C$mV^2/r^2$
- D$\pi r^2/mV^2$
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