Question

On route to senior prom, a couple was cut off by another car. The couple traveling 21 m/s slammed on the breaks and slowed to a speed of 8 m/s in a time of 1.4 seconds. What was the couple’s acceleration?

1) -9.3 m/s^2
2) 9.3 m/s^2
3) 18 m/s^2
4) -18 m/s^2
5) answer not shown

Answer 1

Answer: (1) a = -9.3 m/s^2

Step-by-step explanation:

a = Δv/Δt

a = (8 m/s - 21 m/s)/(1.4 s)

a = -9.3 m/s^2