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MIT 8.01 Physics I Classical Mechanics, Fall 1999 13 Online
OpenStudy (anonymous):

A 80 m^2 platform is in the air. The air flowing underneath it has a v=290 m/s. The air above has a v=340 m/s. The difference of height between "above" and "below" is to be neglected. How big is the force acting underneath, pushing the object upwards? (Air density is not given, neither is mass or pressure.)Thank you!

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