A Rocket Is Fired in a Gravity-Free Environment in Deep

Multiple Choice

A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 8000 kg and ejects gas with a velocity of 2000 m/s. How much gas must be ejected in the first second to give the rocket an acceleration of 30.0 m/s²?

A) 120 kg
B) 7.50 kg
C) 15.0 kg
D) 12.0 kg
E) 150 kg