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One end of a light spring of natural len...

One end of a light spring of natural length 4m and spring constant 170 N/m is fixed on a rigid wall and the other is fixed to a smooth ring of mass `(1)/(2)` kg which can slide without friction in a verical rod fixed at a distance 4 m from the wall. Initially the spring makes an angle of `37^(@)` 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.

A

15 m/s

B

10 m/s

C

20 m/s

D

25 m/s

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The correct Answer is:
C
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