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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 450 kg and car B 495 kg . Car A approaches at 4.50 m/s and car B is moving at 3.70 m/s.

Calculate the change in momentum of car B after the collision.

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