(Answered) A car starts from rest and accelerates uniformly at 20ms2

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A car starts from rest and accelerates uniformly at 2.0m/s^2 toward the north. A second car starts from rest 4.0 s later at the same point and accelerates uniformly at 4.0m/s^2 toward the north. How long after the second car starts doest it overtake the first car?

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