1. The problem statement, all variables and given/known data 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. Relevant 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.