A body of mass $m\, kg$ is rotating in a vertical circle at the end of a string of length $r$ metre. The difference in the kinetic energy at the top and the bottom of the circle is
A body of mass $m\, kg$ is rotating in a vertical circle at the end of a string of length $r$ metre. The difference in the kinetic energy at the top and the bottom of the circle is
- A
$\frac{{mg}}{r}$
- B
$\frac{{2mg}}{r}$
- C
$2mgr$
- D
$mgr$
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