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Questions  

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? 

a
Decreases only when train accelerates
b
Decreases only when train decelerates
c
Decreases in both cases
d
Increases in both cases

detailed solution

Correct option is C

T=2πl|g→+a→|⋅a→ is in horizontal direction in both cases.  Hence, |g→+a→|>g, so T decreases in both cases

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