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A force of 6.4 N stretches a vertical sp...

A force of 6.4 N stretches a vertical spring by 0.1 m. The mass (in kg) that must be suspended from the spring so that it oscillates with a time period of `(pi)/(4)` second.

A

`(pi/4)` kg

B

1 kg

C

`(1/ pi)`

D

10b kg

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The correct Answer is:
B
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