Question

The driver of a car traveling at 30.5 m/s slams on the brakes so that the car undergoes a constant acceleration, skidding to a complete stop in 4.5 s. What is his average acceleration?

-2.6 m/s^2
2.6 m/s^2
6.8 m/s^2
-6.8 m/s^2

Answer 1

-6.8 m/s²

Step-by-step explanation:

Given:

v₀ = 30.5 m/s

v = 0 m/s

t = 4.5 s

Find: a

a = (v − v₀) / t

a = (0 m/s − 30.5 m/s) / 4.5 s

a = -6.8 m/s²