Question

Find the initial velocity of a car which is stopped 10 sec applying brakes.the retardation due to brakes 2.5m/s^2.

Answer 1

$a = - 2.5m {s}^{ - 2} \\ t = 10s \\ v = 0$
using v = u + at
$0 = u + ( - 2.5)(10) \\ u = 25m {s}^{ - 1}$
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