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Two balls are suspended from the ceiling by parallel strings so that they touch each other.....

Two balls are suspended from the ceiling by parallel strings so that they touch each other.. The masses of the balls are 200 g and 100 g. The heavier ball is raised so that its center of mass is now 4.5 cm higher than earlier. Then the ball is released and allowed to collide with each other. If the collision is elastic, find the

final heights of the center of masses of the two balls after the collision?

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