A uniform rod AB of mass m and length 2a...

A uniform rod AB of mass m and length 2a is falling freely without rotationb under gravity with AB horizontal. Suddenly the end A is fixed when the speed of the rod is v. The angular speed which the rod begains to rotate is

`(v)/(2a)`

`(4v)/(3a)`

`(v)/(3a)`

`(3v)/(4a)`

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