Question

A moving car is brought to rest within 20 seconds by applying brakes find the initial velocity v retardation duplication break is 2 metre per second square

Answer 1

Explanation:

given that:

time = 20sec

acceleration = -2m/s2

final velocity(v)=0 m/s

intial velocity(u)= ?

v=u+at

0=u+(-2)(20)

-u=-40

u=40m/s