A pendulum is suspended in a lit and its...

A pendulum is suspended in a lit and its period of oscillation is `T_(0)` when the lift is stationary.
`(i)` What will be the period `T` of oscillation of pendulum, if the lift begins to accelerates downwards with an acceleration equal to `(3g)/(4)` ?
`(ii)` What must be the accleration of the lift for the period of oscillation of the pendulum to be `(T_(0))/(2)` ?

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