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A block of mass m is attached to a pulle...

A block of mass `m` is attached to a pulley disc of equal mass, radius `r` by means of a slack string as shown. The pulley is hinged about its centre on a horizontal table and the block is projected with an initial velocity of `5 m//s`. Find the velocity when the string becomes taut.
.

A

`3 m//s`

B

`2 . 5 m//s`

C

`5 //3 m//s`

D

`10//3 m//s `

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Verified by Experts

The correct Answer is:
D
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