Two bumper cars in an amusement park ride collide elastically as one approaches the other directly..

Two bumper cars in an amusement park ride
collide elastically as one approaches the other directly from the rear (Fig.
9-56). Car A has a mass of 450kg and car B 490 kg, owing to differences in
passenger mass. If car A approaches at 4.50 m/s and car B is moving at 3.70
m/s, calculate (a) their velocities after the collision, and (b) the change in
momentum of each.

FIGURE 9-56