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A mass m attached to spring of natural l...

A mass m attached to spring of natural length `l_0` and spring constant k. One end of string is attached to centre of disc in horizontal plane which is being rotated by constant angular speed `omega`. Find extension per unit length in spring (given `k gtgt m omega^2` ) :

A

`(m omega^2)/k`

B

`sqrt(2)/3(m omega^2)/k`

C

`(m omega^2)/(2k)`

D

`(3m omega^2)/k`

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The correct Answer is:
A
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