As a rocket ascends, its acceleration increases even though the net force on it

Question

As a rocket ascends, its acceleration increases even though the net force on it stays constant. Why? (Assume a traveling distance small enough that the thrust, acceleration due to gravity and atmosphere do not change.) Select correct awnser

A. As a rocket ascends it's momentum increases with it's speed. The greater the momentum of the rocket, the greater the acceleration imparted to it from a given force.

B. The rocket's mass decreases as its fuel is consumed. The same net force acting on a smaller mass results in a larger acceleration.    

C. As the rocket ascends, fuel is burned at a faster rate resulting in a larger acceleration.

D. The faster a rocket moves the more acceleration is imparted to it from a given force

Explanation / Answer

B

The rocket's mass decreases as its fuel is consumed. The same net force acting on a smaller mass results in a larger acceleration.

as net force on rocket is MA = F-Mg => A=F/M - g

as mass decreases F/M increases and A increases

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