WBJEE 2013 Physics Solved Paper

A bar of length l carrying a small mass m at one of its ends rotates with a uniform angular speed ω in a vertical planeabout the mid-point of the bar. During the rotation, at some instant of time when the bar is horizontal, the mass isdetached from the bar but the bar continues to rotate with same ω. The mass moves vertically up, comes back andreches the bar at the same point. At that place, the accele ation due to gravity is g.