Two skaters of mass ma 60kg and mb 90 kg are skating, Ask an Expert

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Two skaters, of mass mA = 60kg and mB = 90 kg, are skating toward each other at the same speed v = 4 m/s. They collide, and during the 20ms collision skater A exerts an average force of 3000N on skater B. What is the speed of skater A following the collision?

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