Question

A moving train is brought to rest within 20sec of applying the breaks . Find the initial velocity if the retardation is 2m/sec

Answer 1

Let, u be the initial velocity

Retardation is a Time is t

Velocity is v

We know, v = u + at

As, the train stops so v = 0 Time t = 20s

Retardation a = 15m/s

Therefore, according to the formula u = 0 + (15*20) = 300 m/s.

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