Question

An express train is moving with a velocity . Its driver finds another
train is moving on the same track in the same direction with velocity
v. To escape collision, driver applies a retardation a on the train, the
minimum time of escaping collision will be
(a)
V
vi v
(b) =
2
(c) None
(d) Both
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Answer 1

Answer:

As the  trains moving in the same direction so the initial relative speed 

(V1−V2) and by applying retardation final relative speed become zero.

From

V=u−atO=(V1−V2)−att=aV1−V2

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Answer 2

Answer:

$t = \frac{v1 - v2}{a}$

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