a moving train is brought to rest within 20s by applying brakes. find the initial velocity if the retardation due to brakes is 2m/s2

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Solution

$i n t i a l v e l o c i t y = u f i n a l v e l o c i t y v = 0 t i m e t = 20 s a c c e l e a r t i o n a = - 2 m / s^{2} v = u + a t 0 = u - 20 \times 2 u = 40 m / s$

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