A car traveling at 115 kmh strikes a tree the front end of

Question

Problem: A car traveling at 115 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.75m.

Part A: What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00 g = 9.80 m/s².

I need help to find the magnitude of the average acceleration of the driver during the collision.