A 1200 kg car traveling 3.0 m/s to the north runs into a telephone pole. The telephone pole completely stops the car. Which of the following is true?
A. Momentum is not conserved because outside forces act on the
system
B. The momentum of the telephone pole after the collision is 3600
kg•m/s to the north.
C. The momentum of the telephone pole after the collision is 3600
kg m/s to the south.
D. The total momentum before the collision equals the total
momentum after the collision.