Question

when a driver hits the brakes, his car decelerates at a uniform rate of 2.0 m/s. His car stops in 9.0 m. How long does it take him to stop?

Answer 1

t = 9.09 seconds

Step-by-step explanation:

I = 2

F = 0

D = 9

A

T = ?

first, lets find acceleration using 1 of our kinematic equations

0^2 = 2^2 + 2(a)(9)

0 = 4 + 18a

-4 = 18a

a = -0.22

now lets use plug these into another kinematic equation

-0.22 = (0-2)/t = -0.

-0.22t = -2

t = 9.09