Air Enters a Turbojet Engine at 180 M/s at a Rate

Multiple Choice

Air enters a turbojet engine at 180 m/s at a rate of 20 kg/s, and exits at 850 m/s relative to the aircraft. The thrust developed by the engine is

A) 17 kN
B) 13 kN
C) 0.8 kN
D) 22 kN
E) 34 kN