You are driving your car at 45 m/s, when a raccoon runs into the street in front of you. You slam on the brakes and come to a stop in 5 seconds. What is the acceleration of your car?

-9m/s²

Explanation:

Given parameters:

Initial velocity = 45m/s

Final velocity  = 0

duration  = 5s

Unknown:

acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time;

        Acceleration  =

v is the final velocity

u is the initial velocity

t is the time taken

 Input the parameters and solve;

     Acceleration  =   = -9m/s²

The car accelerates at a rate of -9m/s² which is a deceleration

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6