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momentum, inertia and an interesting question

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Hello, I have asked several engineers this question but none of them can give me an answer.  my question is: Suppose we had two guns, one with a barrel length of 20 inches and one with a barrel length of 10 inches.  if they both fired the same type of bullet projectile with the necessary differing powder charge to give those bullet projectiles muzzle velocities of 3000 feet per second, from both guns, at the same time, would the bullet from the shorter barrel slow down first?

Thanks

Eddie

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