A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity if retardation due to applying brakes is 2 m/s2.

Asked by Topperlearning User | 9th Nov, 2016, 03:51: PM

Expert Answer:

Given:

Final velocity v = 0

Time taken t = 20 s

Acceleration a = -2 m/s2

From the equation v = u + at, we have

u = v - at

u = 0 - (-2) × 20

u = 40 m/s2

Answered by  | 9th Nov, 2016, 05:51: PM