How fast is the center of mass of two-stone system

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Q. A stone is dropped at t = 0. A second stone, with 6 times the mass of the first, is dropped from the equivalent point at t = 59 ms. (a) How far below the release point is the center of mass of the two stones at t = 440 ms? (Neither stone has yet reached ground.) (b) How fast is the center of mass of two-stone system moving at that time?

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