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Two students are on a balcony 20.7 m abovethe street. One student throws a ball ver-tically downward at 13.2 m/s. At the sameinstant, the other student throws a ball verti-cally upward at the same speed. The secondball just misses the balcony on the way down. What is the magnitude of the velocity ofthe first ball as it strikes the ground?

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