Can someone help me with physics? I tried working this problem out on my own but the answers came out wrong.
An initially motionless test car is accelerated uniformly to 125 km/h in 8.28 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.395 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? What is the magnitude of the average acceleration of the car during the collision?

Question

Can someone help me with physics? I tried working this problem out on my own but the answers came out wrong. 
An initially motionless test car is accelerated uniformly to 125 km/h in 8.28 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.395 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? What is the magnitude of the average acceleration of the car during the collision?

anonymous · Answer

what i did first was i converted 125 km/h to m/s and same goes with 65.5 km/h to m/s. initial velocity would be zero so i divided the first velocity by 8.28 sec to get the answer but my answer came out wrong. where did i make the mistake?