A disc of mass m and radius r is free to...

A disc of mass m and radius r is free to rotate about its centre as shown in the figure. A string is wrapped over its rim and a block of mass m is attached to the free end of the string. The system is released from rest. The speed of the block as it descends through a height h, is :-

`sqrt(2gh)`

`sqrt((2)/(3)gh)`

`2sqrt((gh)/(3))`

`(1)/(2)sqrt(3gh)`

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