A 1,200-kilogram car traveling at 10 meters per sec- ond hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest: 1. 1.2 x 102 N 2. 1.2 x 103 N 3. 1.2 x 104 N 4. 1.2 x 105 N