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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. Car A has a mass of 435 kg and car B 495kg, owing to differences in passenger mass. If car A approaches at 4.50m/s and car B is moving at 3.70m/s, calculate (a) their velocities after the collision, and (b) the change in momentum of each.

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