A sphere of mass $m$ is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed $v$. The work done in full horizontal circle is
A sphere of mass $m$ is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed $v$. The work done in full horizontal circle is
- A
$0$
- B
$\left( {\frac{{m{v^2}}}{l}} \right)\,.\,2\pi l$
- C
$mg\,.\,2\pi l$
- D
$\left( {\frac{{m{v^2}}}{l}} \right)\,.\,(l)$
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