Posted by **Milli** on Tuesday, February 21, 2012 at 11:12am.

Ball 2 with a mass of 30 kg, is moving left at 10 m/s. At what velocity should ball 1, with a mass of 10 kg, move to the right and collide with 2, so that ball 1 rebounds with a velocity of 10 m/s. assume that the collision is perfectly elastic.

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