A Roller Derby Exhibition recently came to town. They packed the gym for two
consecutive weekend nights at South's field house. On Saturday evening, the
68-kg Anna Mosity was moving at 17 m/s when she collided with 76-kg Sandra
Day O'Klobber who was moving forward at 12 m/s and directly in Anna's path.
Anna jumped onto Sandra's back and the two continued moving together at
the same speed. Determine their speed immediately after the collision.
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