A train is moving with a velocity of 60 km/h. It is brought to rest in 2 minutes by applying brakes. What is the retardation of the train?
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Question

A train is moving with a velocity of 60 km/h. It is brought to rest in 2 minutes by applying brakes. What is the retardation of the train?

Accepted Answer

Initial velocity u = 60 km/h = 60 (5/18) = 50/3 m/s. Final velocity v = 0. Time t = 2 min = 120 s. Acceleration a = (v - u)/t = (0 - 50/3) / 120 = -50 / 360 = -5/36 m/s^2. Retardation is 5/36 m/s^2.

Motion in a Straight Line

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