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Two cars are headed south on the highway at different speeds. Starting when the faster car pulls alongside the slower car, one of the cars accelerates northward for 5.0 s and the other accelerates southward for 5.0 s. At the end of that 5.0-s interval, the two cars have the same speed. Which car is now ahead?

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Two cars going in the same direction have different speeds, but after 5s5\:\text{s} of accelerating, they have the same speeds. The faster car will be denoted as car 11, and the slower car 22. Since the cars are moving in one dimension, denote south as +xx and north as -xx.

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