Motion in A Plane

Question: 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

1) 0

2) \[\left( {\frac{{m{v^2}}}{l}} \right)\,.\,2\pi l\]

3) \[mg\,.\,2\pi l\]

4) \[\left( {\frac{{m{v^2}}}{l}} \right)\,.\,(l)\]

Solution:

Explanation: Explanation

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