Air flows into the jet engine shown at a rate of 9 slug/s and a speed of 300 ft/s. Upon landing, the engine exhaust exits through the reverse thrust mechanism with a speed of 900 ft/s in the direction indicated. Determine the reverse thrust applied by the engine to the airplane. Assume the inlet and exit pressures are atmospheric and that the mass flowrate of fuel is negligible compared to air flowrate through the engine. 4-ft diameter (1) V = 300 ft/s 30 V3 = 900 ft/s (3) (2) V = 900 ft/s