Air in a v (km/h) wind strikes head on the face of a building x (meters) wide by

Question

Air in a v (km/h) wind strikes head on the face of a building x (meters) wide by y (meters) high and is brought to rest. If air has a mass of m (kg/m^3), determine the average force of the wind on the building. *Answer has should only include the variables and perhaps universal constants. My assumption would be g. As well as conversion factors. I know that the km/h= is 0.28 m/s. I know the end result but I got there by a fluke. I am unsure of how to show my steps from the original problem to the ending solution.

Explanation / Answer

v km/hr is 0.28 v m/s........... So in one second, a volume of air x*y*0.28 v is brought to a stop. That is 0.28xyv m

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