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A pole is floating in a liquid with 80 c...

A pole is floating in a liquid with 80 cm of its length immersed. It is pushed doun a certain distance and then released. Time period of vertical oscillation is

A

`(4pi)/7s`

B

`(3pi)/7s`

C

`(2pi)/7s`

D

`(pi)/7s`

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The correct Answer is:
A
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