Question

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

Answer 1

a = v-u/t
-25/10 = 0-u/10
-u = -25
u = 25

Answer 2

Answer:

Initial velocity = 25 m/s

Explanation:

Time = 10 sec, Retardation = -2.5 m/s^2 and Final velocity = 0 m/s

v = u + at (First Equation Of Motion)

0 = u + (-2.5)(10)

0 = u - 25.0

-u = -25.0

u = 25 m/s