Janet is skating at the ice rink with her little sister Sarah who is initially standing at rest on the ice. Janet then collides head-on into Sarah. Janet continues forward at 2 m/s, while Sarah is thrown backward at 3 m/s. (After the collision, Janet and Sarah are moving in the same direction). Janet’s mass is 54 kg and Sarah’s mass is 34 kg. How fast was Janet moving initially, in m/s?

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