A 2.00 x 103-kg car has a speed of 12.0 m/s. The car then hits a tree. The tree doesn’t move, and the car comes to rest.
1. Find the change in kinetic energy of the car.
2. Find the amount of work done in pushing in the front of the car.
3. Find the size of the force that pressed in the front of the car by 50.0 cm.