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Two billiard balls of equal mass move at right angles and meet at the origin of a xy coordinate system. One is moving upward along the y axis at 2.1 m/s and the other is moving to the right along the x-axis with a speed of 3.8 m/s. After the elastic collision, the second ball is moving along the positive y-axis. What is the final direction of the first ball, and what are their two speeds?
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