Concept Simulation 7.1 illustrates the physicsprinciples in this problem. An astronaut in his space suit and witha propulsion unit (empty of its gas propellant) strapped to hisback has a mass of 147 kg. During a space-walk, the unit, which hasbeen filled with propellant gas, ejects some gas with a velocity of+31.0 m/s. As a result, the astronaut recoils with a velocity of-0.247 m/s. After the gas is ejected, the mass of the astronaut(now wearing a partially empty propulsion unit) is 163 kg. What percentage of the gas propellant in the completely filledpropulsion unit was depleted?