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General
Easy
Question
One end of a spring of natural length ' h ' and spring constant ' k ' is fixed at the ground and the other is fitted with a smooth ring a mass ' m ' which is allowed to slide, on a horizontal rod fixed at a height ' h ' as shown in figure. Initially the spring makes an angle of 37° with the vertical when the system is released from rest. Find the speed of the ring when the spring becomes vertical? 
The correct answer is:
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