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[QUOTE]Originally posted by Identity Crisis: [QB] Oh, I see. You are confused. You say "remember, there's no such thing as negative momentum". That's a potentially confusing statement. Momentum is a vector quantity as we agree. Momentum of mv in any direction is cancelled out by momentum of mv in the opposite direction. You get this right when you apply it to the momentums created along the y-axis. And you get it right when you apply it to the momentum of the particle along the x-axis. But for some reason, you get it wrong when you apply it to the momentum of the ship along the x-axis. Here are three simple statements, please write your versions of the same in the same terms. * When the particle is created the ship gains momentum of magnitude mv in direction x. * When the particle strikes the first barrier the ship gains a momentum of magnitude mv in the direction -x. * When the particle strikes the second barrier the ship gains a momentum of magnitude mv in the direction -x. BTW, this is _exactly_ the same as if the particle had hit and bounced off a barrier in the y plane. (i.e. a 180deg collision). The only reason I made it two 90deg collisions was because people were complaining about the exhaust particles going back into the impulse drive. [/QB][/QUOTE]
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