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A body of mass m is attached to lower en...

A body of mass m is attached to lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass m is slightly pulled down and released, it oscillates with a time period of 3s. When the mass m is increased by 1 kg, the time period of oscillations becomes 5s. Find the value of m is kg.

A

`16/9`

B

`9/16`

C

`3/4`

D

`4/3`

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