Homework Help: physics

Posted by john on Thursday, January 6, 2011 at 8:43pm.

a 2 kilogram rifle initially at rest fires a 0.002 kilogram bullet. as the bullet leaves the rifle with a velocity of 500 meters per second, what is the momentum of the rifle bullet system?
isn't the answer one because final momentum minus initial momentum is 1-0 which is one

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