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Q. An airplane with a mass of 2.6*10^6 kg. has the air flow past the lower surface of the wings at 100 m/s. If the wings have a surface area of 1200 m2, how fast must the air flow over the upper surface of the wing if the plane is to stay in the air?

Q. A 48 kg woman in an elevator is accelerating upward at a rate of 1.8 m/s. what is the gravitational force acting upon the woman?

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