Calculate the ratio of the drag force on a jet flying at 999 km/h at an altitude of 8.10 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.490 kg/m3 at 8.10 km and 0.725 kg/m3 at 4.05 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”