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Mass of the pulley is m & radius is R. A...

Mass of the pulley is m & radius is R. Assume pulley to be disc. Block of mass m is released from the position shown. String is massless & inextensible. There is no slipping between rope and pulley. The impulse exerted by the string on the pulley at the moment string becomes taut is `J` then`(2msqrt(gR))/(J)` is equal to

A

5

B

3

C

1

D

none of these

Text Solution

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The correct Answer is:
B
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