An antique rifle fires 9mm bullets. What is the equation that represents the speed of the bullets as they travel down the barrel of the rifle?
A) v = (-5.00x10^7)t^2 + (2.80x10^5)t
B) v = (-5.00x10^7)t^2 + (2.80x10^5)t + 9mm
C) v = (-5.00x10^7)t^2 + (2.80x10^5)t - 9mm
D) v = (-5.00x10^7)t^2 + (2.80x10^5)t - 2.80x10^5