Figure shows a light rod of length λ rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below, the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h so that the block moves in a complete circle about the ring?
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The minimum velocity required to cross the height point 
Let the rod released from a height h.
Total energy at A=total energy at B
[Because v is the required velocity at B such that the block make a complete circle.
Refer 
So 
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