$A$ sphere of mass $m$ is tied to one 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 a full horizontal circle is
- A$0$
- B$\left( \frac{mv^2}{l} \right) \cdot 2\pi l$
- C$mg \cdot 2\pi l$
- D$\left( \frac{mv^2}{l} \right) \cdot l$
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