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