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OpenStudy (anonymous):
ball 2 with a mass of 30kg is moving to the left at 10 m/s. With what velocity should ball 1, with a mass of 10kg, move to the right and collide with ball 2, so that ball 1 rebounds with a velocity of 30m/s, and ball 2 with a velocity of 10m/s, after the collision. Assume the collision to be perfectly elastic.
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