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Let's say I am in a bumper car and have a velocity of 8m/s, driving east. I and my car have a mass of 70 kg. You are in a bumper car, sitting still. I run into you, and we collide elastically. If I end up with a velocity of 1 m/s going west, am I heaver or lighter than you? What is your mass, and what is your final velocity?

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