Finding the hange in inetic energy

[sylavel]

Homework Statement

A 1609 kg car has a speed of 11.9 m/s when it hits a tree. The tree doesn't move and the car comes to rest.
Find the change in kinetic energy of the car. Answer in units of J.

Homework Equations

KE=1/2mv^2

The Attempt at a Solution

Okay so like I am not completely sure where to go here...
I started out in finding the kinetic energy
KE=1/2(1609)(11.9)^2=113925.245
Any help would be super awesome.

 

[LowlyPion]

Homework Statement

A 1609 kg car has a speed of 11.9 m/s when it hits a tree. The tree doesn't move and the car comes to rest.
Find the change in kinetic energy of the car. Answer in units of J.

Homework Equations

KE=1/2mv^2

The Attempt at a Solution

Okay so like I am not completely sure where to go here...
I started out in finding the kinetic energy
KE=1/2(1609)(11.9)^2=113925.245
Any help would be super awesome.

OK You found the Kinetic energy for before impact.

What is the KE after impact? What is v?

What is the difference?