A simple pendulum hung from the ceiling of a train moving at constant speed has a period T. If the train starts accelerating or decelerating, then what will be the effect
on time period of Pendulum?

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Decreases only when train accelerates

Decreases only when train decelerates

Decreases in both cases

Increases in both cases

answer is C.

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Detailed Solution

$T = 2 π \sqrt{\frac{l}{| \vec{g} + \vec{a} |}} \cdot \vec{a} is in horizontal direction in both cases.$

$Hence, | \vec{g} + \vec{a} | > g, so T decreases in both cases$

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