Question

find the intial velocity of a car which is stoped in 10sec the retardation due to brakes is 2.5m/s

Answer 1

Hey !
Here is your answer !!
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Given

v = 0

t = 10seconds


a = - 2.5m/s2

To find ----> u = ?


Using the formula

a = v - u / t

-2.5 = 0 - u / 10

- 2.5 × 10 = - u

-25 = - u

u = 25

Therefore initial velocity ( u ) = 25m/s
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Hope it helps !!

Answer 2

u = ?

v = 0 (since , after applying brakes it comes at rest)

time = 10s

a = -2.5m/s^2

by the first eq. of motion we know ,
v = u + at

so, u = v-at

= 0 - (-2.5) × 10 m/s

= 0 + 25 m/s

= 25 m/s

hence ,initial velocity = 25 m/s

hope this helps....