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Problem 12 Two particles, A and B, move along the x axis. Their positions as a function of time are given by xA =

Problem 12 Two particles, A and B, move along the x axis. Their positions as a function of time are given by xA = t2-4t+4 and xB = -3t2 + 2t+1, where x is in meters and t is in seconds. At what time do the two particles reach their closest approach to each other? Give your answer in seconds to 2 significant figures.

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