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March 27, 2017

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an automobile moving at constant velocity of 15m/sec passes a gasoline station. two seconds later another automobile leaves the gasoline station and accelerates at a constant rate of 2m/ sec squared. how soon will the second automobile overtake the first ?

  • physics - ,

    They will pass when the distances traveled are equal.

    15 t = (a/2)(t-2)^2 = (t-2)^2

    Solve for t, which is measured from the time the 15 m/s car goes by the station.

    t^2 -4t +4 = 15 t
    t^2 -19t +4 = 0

    t = (1/2)[19 +sqrt345) = 18.79 s

    Both cars will have travelled 282 m at that time

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