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Ball A has a mass of 1.1 kg and moves with an initial speed of 12.5 m/s. It collides with stationary balls B and C, whose centers are on a line perpendicular to the initial velocity of ball A and that are initially in contact with one-another. Balls B and C are identical and have a mass of 0.5 kg. After the collision, balls B and C have the same speed, 4.2 m/s, but ball B moves at an angle of 22 above the horizontal and ball C moves at an angle of 22 below the horizontal. What is the velocity of ball A after the collision?

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