A ball of mass m is attached to one end ...

A ball of mass `m` is attached to one end of a light rod of length `l`, the other end of which is hinged. What minimum velocity `v` should be imparted to the ball downwards, so that it can complete the circle ?

`sqrt(g varphi)`

`sqrt(5g varphi)`

`sqrt(3g varphi)`

`sqrt(2g varphi)`

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