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A marksman holds a rifle of mass mR = 3.00 kg loosely, so it can recoil
freely. He fires a bullet of mass mB = 5.00 g horizontally with a
velocity relative to the ground of vBx = 300 m/s. What is the recoil
velocity vRx of the rifle? What are the final momentum and kinetic energy
of the bullet and rifle?

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