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Time period of simple pendulum of length...

Time period of simple pendulum of length l when placed in a lift which is accelerating upwards with the acceleration `g/6` is

A

`2 pi (sqrt(6l/7g))`

B

`2 pi (sqrt(7l/6g))`

C

`2 pi (sqrt(3l/2g))`

D

`2 pi (sqrt(5l/7g))`

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