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## Homework Statement

A 2436 kg car has a speed of 10.7 m/s when it hits a tree. The tree doesn’t move and the

car comes to rest.

a) Find the change in kinetic energy of the car.

b) Find the amount of work done by the car as its front is pushed in.

c) Find the magnitude of the force that pushed the front of the car in by 54 cm.

## Homework Equations

Kinetic energy=1/2mass*speed^2

## The Attempt at a Solution

1/2*2436(10.7^2)=139449J of kinetic energy now what