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The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 7.20*10^-3 and a speed of 601 relative to the muzzle when fired from a rifle that has mass 3.10kg . The loosely held rifle recoils at a speed of 2.05 m/s relative to the earth. Find the momentum of the propellant gases in a coordinate system attached to the earth as they leave the muzzle of the rifle.

a) 6.36 kg-m/s

b) 3.18 kg-m/s

c) 4.33 kg-m/s

d) 11.0 kg-m/s

e) 2.03 kg-m/s

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