A simple pendulum attached to the ceilin...

A simple pendulum attached to the ceiling of a stationary lift has a time period T. The distance y covered by the lift moving upwards varies with time t as `y = t^(2)` where y is in metres and t in seconds. If `g = 10 m//s^(2)`, the time period of pendulum will be

`sqrt(4/5)T`

`sqrt(5/6)T`

`sqrt(5/4)T`

`sqrt(6/5)T`

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