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A stone is dropped at t = 0. A second stone, with 3 times the mass of the first, is dropped from the
same point at t = 98 ms. (a) How far below the release point is the center of mass of the two stones
at t = 300 ms? (Neither stone has yet reached the ground.) (b) How fast is the center of mass of the
two-stone system moving at that time?

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