Question

find the initial velocity of car which have is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 meter per second sq

Answer 1

We have,
a = -2.5m/s² (retardation is always negative)
t = 10sec
v = 0. (because after applying brakes the car will finally stop i.e, 0)
u=?

We know the equation for motion:
v=u+at
v-at=u
u=v-at
u=0-(-2.5*10)
u=0-(-25)
u=0+25
u=25m/s

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