Question

find the innisial velocity of a car which is stopped in 10 second why applying breaks the redardation due to breaks 2.5 sqare

Answer 1

first of all write all the given values
t = 10s
a = -2.5 (since it is retardation)
v = 0 (because after applying the brakes the car will stop))

we know that

v = u + at
0 = u + (-2.5) (10)
0 = u - 25
u = 25m/s

is the answer