A 1200 Kg Car Is Moving at 5

Multiple Choice

A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars undergo an elastic collision and move in the EAST or WEST direction. The magnitude of the relative velocity between the cars after the collision is

A) 3.0 m/s.
B) 1.0 m/s.
C) 4.0 m/s.
D) 5.0 m/s.
E) 2.0 m/s.