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**1. Homework Statement**

What is the net upward force on an airplane wing of area 20 m2 if the speed of air flow is 300 m/s across the top and 280 m/s across the bottom.

**2. Homework Equations**

**3. The Attempt at a Solution**

I have a feeling that this is an easy question, but i just don't know how to solve it!! Any hints would be greatly appreciated.