What is the net upward force on an airplane wing of area 20 m^2 . if the speed of airflow is 300 m/s across the top of the wing and 280 m/s across the bottom? assume the Density of air is 1.29 kgm^-3 .
a. 3.5*10^4
b. 5.5*10^7
c.4.5*10^8
d.1.5*10^5
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