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A mass 'M' is suspended from a spring of...

A mass 'M' is suspended from a spring of negligible mass. The spring is pulled a little and then released. It execuutes S.H. oscillations of period T. When mass is increased by 'm', the period becomes `(5)/(4)` T, the ratio `(m)/(M)` is :

A

`9//16`

B

`25//16`

C

`4//5`

D

`5//4`.

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The correct Answer is:
A
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