One skater throws a .3 kg ball at 5 ms to his friend who, Ask an Expert

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Two skaters, both of mass 75 kg, are on skates on a frictionless ice pond. One skater throws a .3 kg ball at 5 m/s to his friend, who catches it and throws it back at 5 m/s. When the first skater has caught the returned ball, what is the velocity of each of the two skaters?

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