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A 84kg boy running north at 8m/s collides with a 75 kg boy running at 7m/s...

A 84kg boy running north at 8m/s collides with a 75 kg boy running at 7m/s south. If the 84kg boy continues moving at 1.2m/s north. What is the 75kg boy's north velocity after the collision in m/s?
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