Question

When a car screeches to a sudden stop to avoid hitting a dog, it slows down from 9.00 m/s to 0.00 m/s in 1.50 s. Find the average acceleration of the car?

Answer 1

Acceleration is change in velocity over time, or
a = (v2 - v1) / t

Substituting,
a = (0 - 9) / 1.5
a = ?

Now solve for a, note that it's negative since the final velocity is smaller than the initial velocity. Units in m/s^2
Hope this helps~ `u`

Answer 2

-6 meters per second