A pendulum suspended from the ceiling of a train oscillates with a time period $2$ $second$ , when the train is accelerating at $10\,ms^{-2}$. What will be its time period when the train retards at $10\,ms^{-2}$ ? .... $s$
$2$
$2\sqrt 2$
$(2/\sqrt 2)$
None of the above
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Identify the correct statement