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Colin, who has a mass of 38.2 kg, is roller skating toward his mom at...

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Physics

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Colin, who has a mass of 38.2 kg, is roller skating toward his mom at -2.3 m/s. Mom, with a mass of 72.8 kg is skating toward Colin at 4.4 m/s. When they collide, Mom grabs Colin's hand and they continue skating together. How fast are they skating together? Round your answer to the nearest 0.1. Do not add units.

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