30. A 1800 Kg car is moving at 30 m/s. when brakes are applied. If the average force
exerted by the brakes is 6000N, find the distance travelled by the car before it comes t
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Mass m = 1800 kg Initial velocity u = 30 m/s F = 6000 N = ma = 1800 a a = 6000/1800 = 3.33 m/s2. Retardation = - a Final velocity v = 0 m/s v2 - u2 = 2aS Distance travelled S = (0 - 302)/(-2 x 3.33) = 900/6.66 =135.1 m
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