What Was the Average Acceleration During a Car Collision?

[atbruick]

Homework Statement

A car traveling 81 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m.

What was the average acceleration of the driver during the collision?

Homework Equations

The Attempt at a Solution

I've converted the speed to meters per second but keep getting stuck when trying to get the equations of the distances.

 

[curiousphoton]

Homework Statement

A car traveling 81 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m.

What was the average acceleration of the driver during the collision?

Homework Equations

The Attempt at a Solution

I've converted the speed to meters per second but keep getting stuck when trying to get the equations of the distances.

What relevant equations are you trying to use

 

[atbruick]

I actually just figured out what I was doing wrong!