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A passenger train is moving at 5 ms ^ ...

A passenger train is moving at 5 ` ms ^ ( -1 ) ` . An express train is travelling at 30 ` ms ^ ( -1 ) ` , on the same track and rear side of the passenger train at some distance. The driver in express train at some distance. The driver in express train applied brakes in 4 ` ms ^ ( -2 ) ` , the time in which the accident is avoided after the application of brakes is

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