An object travelling at a speed of 36 kmph comes to rest in a distance of 200 m after the brakes were applied. The retardation produced by the brakes is

Question

An object travelling at a speed of 36 kmph comes to rest in a distance of 200 m after the brakes were applied. The retardation produced by the brakes is, 0.25 m s − 2, 0.20 m s − 2, 0.15 m s − 2, 0.10 m s − 2

MARKS App · Accepted Answer

From the equations of kinematics, v 2 - u 2 = 2 a s Given, u = 36 kmph = 10 m s - 1 and s = 200 m ⇒ 0 - 10 2 = 2 × a × 200 ⇒ - 100 = a × 400 ⇒ a = - 0 . 25 m s - 2

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