Johns mass is 86 kg and barbaras is 55 kg he is standing on, Ask an Expert

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John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xJ = +9.0 m, while she is standing on the x axis at xB = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

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