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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 November 2016, 3:51 PM
Answered by 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 Expert 9th November 2016, 5:51 PM
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