In preparation for a trip to Mars and unmanned rocket sets off it's engine.  The engines work by pushing gas out of the back of the rocket.  In the test 100.0 kg of gas is shot out of the engines, reaching a velocity of 75.0 m/s from rest over the 5.00 m length of the engine.

A.  Calculate the acceleration of the gas.

B.  Calculate the force applied to the gas.
C.  The test rocket has a mass of 2000.0 kg.  If the engines are run for 10.0 s, what is the velocity of the rocket?