An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her
back ejects some gas with a velocity of 50 m/s. The astronaut recoils with a velocity of 1.0
m/s. If the mass of the astronaut and space suit after the gas is ejected is 120 kg, What is the
mass of the gas ejected?
(A)
(B)
(C)
(D)
1.0 kg
1.9 kg
2.4 kg
3.00 kg