1. Two small cars are connected by a spring of negligible mass. Both cars are moving in the positive direction at 2.5 m/s. Car A has a mass of 2.4 kg. The spring pushes the masses apart and, after the spring expands, Car A is moving
at 3.1 m/s in the positive direction and Car B is moving at 2.1 m/s in the positive direction. Assume the track to be
frictionless and horizontal and that there are no net forces external to the system.
A. What is the mass of Car B?
B. What was the impulse that acted on Car A?
C. What was the net work done on car A?