• # question_answer A pendulum suspended from the roof of a train has a period T (when the train is at rest). When the train is accelerating with a uniform acceleration 'a', the time period of the pendulum will A)  increase                        B)  decrease C)  remain unaffected D)         become infinite

[b] The time period of pendulum $(T)=2\sqrt[\pi ]{c/g}$ here i is pendulum length and g is acceleration of gravity. When train accelerates, new weight relative to train coach will be bigger. So, g will be bigger. This would reduce the period of pendulum.