The thrust required for a cargo aircraft to fly straight, level and steady was measured. In each measurement the speed and altitude of the aircraft was the same but the

weight changed. When the weight was 130 kN, empty weight with no cargo and little fuel, the thrust required was T =18.7 kN. When the weight was 30 kN above the empty weight the thrust required increased by dT0.50 kN (Total thrust in this case is T+ dT kN). What (total) thrust would be required to fly at the same speed and altitude if the weight was 50 kN above the empty weight? The answer should have units of kN.