Q22 of 139 Page 41

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s2.

t = 10 sec

a = -2.5 m/ s2


v = 0 m/s


v-u = at


On applying the formula, we get


t = 25m/s


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