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Two identical springs are attached to a small block P. The other ends of the springs are fixed at A and B, When P is in equilibrium the extension of bottom spring is 10 cm. The period of small vertical oscillations of P about is equilibrium position is `(use "g"=9.8 m//s^(2))`

A

`(2pi)/7sec`

B

`(pi)/7sec`

C

`(2pi)/5sec`

D

none of these

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The correct Answer is:
B
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