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

37 m/s

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40 m/s

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53 m/s

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29 m/s

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Solution

The correct option is B
40 m/s

Final velocity = 0

Acceleration = -2 m/s²

Time = 20 sec

Using formula, v = u + at

0 = u -2 x 20

u (initial velocity) = 40 m/s

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