An express train is moving with a velocity v 1 . Its driver finds another train is moving on the same track in the same direction with velocity v 2 . To escape collision, driver applies a retardation a on the train. the minimum time of escaping collision will be
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As the trains are moving in the same direction. So the initial relative speed \{v_1 - v_2\} and by applying retardation final relative speed becomes zero.
From \(\mathbf{v} = \mathbf{U} - \alpha \mathbf{r}^*\) ⇒ ⇒ \(0 \quad \{ \nu_1 - \nu_2 \} - \alpha \alpha'\) ⇒ ⇒ \(t = \frac{v_1 - v_2}{g}\)
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