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 $10\,ms^{-2}$ ? ..... $\sec$
  • A$2$
  • B$2\sqrt 2$
  • C$\left( {2\sqrt 2 } \right)$
  • D
    None of the above
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