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As shown in the figure, a bob of mass m ...

As shown in the figure, a bob of mass m is tied by a massless string whose other end is wound on a fly wheel Ring of radius r and mass m. When released from rest the bob starts falling vertically. When it has covered a distance of h, the speed of the bob will be :

A

`sqrt(2 gh)`

B

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

C

`sqrt(gh)`

D

`sqrt(1.5 gh)`

Text Solution

Verified by Experts

The correct Answer is:
C
`mgh = (1)/(2) (mr^(2)) ((v)/(r))^(2) + (1)/(2) mv^(2) , " " mgh = mv^(2) " " rArr " " v = sqrt(gh)`
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