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Q. An airplane has a mass of 1.5×10^6, and the air flows past the lower surface of the wings at 92. If the wings have a surface area of 1400, how fast should the air flow over upper surface of the wing if the plane is to stay in the air?

Q. A 1200 kg car carrying four 81.00 kg people travels over a rough "washboard" dirt road with corrugations 4 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 18 km/h. The car now stops, and the four people get out. By how much does the car body rise on its suspension owing to this reduce in weight?

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