A jet airplane with a mass of 5 Mg has a touchdown speed of 300 km / h, at which instant the braking parachute is deployed and the power shut off. If the total drag on the aircraft varies with velocity as shown in the accompanying graph, calculate the distance x along the runway required to reduce the speed to 150 km / h. Approximate the variation of the drag by an equation of the form D = kv², where k is a constant.

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120 100 80 60 40 100 200 300 Velocity v, km/h Drag D, kN 20