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 kg and a speed of 601 m/s relative to the muzzle when fired from a rifle that has mass 3.10 kg . The loosely held rifle recoils at a speed of 2.15 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.
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