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Q. A cat walks in a straight line, which we shall call the x-axis with the positive direction to the right. As an observant physicist, you make measurements of this cat's motion and construct a graph of the feline's velocity as a function of time.

Q. A stone is dropped at t = 0. A second stone, with twice the mass of the first, is dropped from the same point at t = 150 ms.

(a) How far below the release point is the center of mass of the two stones at t = 550 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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