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To make the ball land on the line, you would have to time the firing of the gun with the barrel acceleration so as to put the ball above the line when it reaches 55mph.
The rear bumper of the truck is not really a part of the equation. Excess information that will distract a lot of people away from a correct answer.
The theory is sound, what isn't is a trigger system. Someone get MythBusters on this ASAP. lol
-Tim
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