A Rocket Ejects Fuel at a Constant Exhaust Speed

Multiple Choice

A rocket ejects fuel at a constant exhaust speed. If the final mass of the rocket is equal to the mass of the initial fuel on board, the ratio of the final speed of the rocket to the exhaust speed is

A) zero.
B) less than 1/2 but larger than 0.
C) exactly 1/2.
D) larger than 1/2 but less than 1.
E) larger than 1.