One end of a light spring of natural length d and spring constant K is fixed on a rigid wall and the other is fixed to a smooth ring of mass m which can slide without friction in a vertical rod fixed at a distance d from the wall. Initially the spring makes an angle of 37º with the horizontal as shown in figure. When the system is released from rest, find the speed of the ring when the spring becomes horizontal.
[sin 37º = 3/5]
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