The speed of a bullet as it travels down the barrel of a, Ask an Expert

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The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by the expression v(t)=(-3*10^7)t^2+(2.5*10^5)t, where is in m/s and is in seconds. If the bullet is accelerated for 2.6 (milliseconds), what is the length of the barrel?

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