Question

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?

Answer 1

-9m/s²

Step-by-step 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- u)/(t)`

v is the final velocity

u is the initial velocity

t is the time taken

Input the parameters and solve;

Acceleration =
`(0 - 45)/(5)` = -9m/s²

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