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How do you calculate the energy and pressure on an object by using the wind speed? There has to be some equations for this but I can't find them. I'm not talking about some differential equation from fluid dynamics where you need to know the density of the air and the ballistic coefficient of the object. I'm talking nice simple 'air' blowing against something flat equations.

Say you have a 4 by 4 sheet of plywood placed perpendicular to the air flow. How much energy would be acting on it if the wind speed was 5 mph? Assuming the pressure were equal over the entire area, which it wouldn't be, what would be pressure per unit of area be?