An Astronaut in a Space Suit Is Motionless in Outer

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 40.0 m/s.The astronaut recoils with a velocity of 1.00 m/s.If the mass of the astronaut and space suit after the gas is ejected is 100 kg and the mass of the gas ejected is 2.50 kg,then the total kinetic energy after the ejection of the gas is

A) 2,050 J.
B) 3,430 J.
C) 4,150 J.
D) 5,070 J.
E) 6,320 J.

Correct Answer:

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