An initially motionless test car is accelerated uniformly to 135 km/h in 7.93 seconds before striking a …..?

An initially motionless test car is accelerated uniformly to 135 km/h in 7.93 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.995 seconds, after which the car is measured to be traveling at 65.5 km/h. What is the magnitude of the acceleration of the car before the collision?

135 km/h = 37.5 m/s
65.5km/h = 18.2 m/s
Prior to the collision, a = Δv / Δt = 37.5m/s / 7.93s = 4.73 m/s²
During the collision, a = | (18.2 – 37.5)m/s / 0.995s | = 19.4 m/s²
Average acceleration a = 18.2m/s / (7.93 + 0.995)s = 2.04 m/s²