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Two cars A and B travel in a straight l...

Two cars A and B travel in a straight line.The distance of A, from the starting point is given as a function of time by `x_(A)(t)=at+bt^(2)` with `a=4m/s` and `b=2m/s^(2)` .The distance of B from the starting point is given as `x_(B)(t)=ct^(2)+dt^(3)` with `c=2m/s^(2)` and `d=1m/s^(3)` . Which car moves ahead just after they leave the starting point?

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