A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest, its time pe...

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A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest, its time period is \( T \). With what acceleration should the lift be accelerated upwards in order to reduce its period to \( T / 2 \) ? (Take, \( g \) is acceleration due to gravity).
(a) \( 2 g \)
(b) \( 3 g \)
(c) \( 4 \mathrm{~g} \)
(d) \( g \)
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