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Ball A, which has mass 23 kg, is moving horizontally left to right at +7.8 m/s...

Ball A, which has mass 23 kg, is moving horizontally left to right at +7.8 m/s when it overtakes the 67 kg ball B, which is moving left to right at +4.7 m/s, and they collide elastically. (a) What is ball A's velocity after the collision? (b) What is ball B's velocity?

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