Two identical railroad cars sit on a horizontal track, with a distance D between their two centers

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Two identical railroad cars sit on a horizontal track, with a distance D between their two centers of mass. By means of a cable between them, a winch on one is used to pull the two together. 

(a) Describe their relative motion. 

(b) Repeat the analysis if the mass of one car is now three times that of the other.

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