A uniform rod of mass m and lkength 2a l...

A uniform rod of mass m and lkength 2a lies at rest on rotating with angular speed `omega_(0)=40rad//s` is placed between two smooth walls on a rough ground. Distance between the walls is slightly greater than the diameter of the sphere . Cofficent of friction between the sphere and the ground is `mu`=0.1. Sphere will stop rotating after time t=.......s.

`(4)/(13)mv^(2)`

`(1)/(4)mv^(2)`

`(8)/(25)mv^(2)`

None of these

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