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Question : A heavy body of mass m hangs on a flexible thread in a railw...

A heavy body of mass m hangs on a flexible thread in a railway carriage which moves at speed {{v}^{0}} on a train-safety test track, as shown in the figure. The carriage is brought to rest by strong but uniform braking. Can the pendulum travel through {{180}^{\omicron }} , so that the taut thread reaches the vertical?

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