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Homework Statement
Air in a 140 km/h wind strikes head-on the face of a building 60 m wide by 50 m high and is brought to rest. If air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building.
Homework Equations
The book seems to suggest the impulse equation.
The Attempt at a Solution
I have stared at the problem for a while. I thought I could use the impulse equation but I don't have a change in time. Also, it gives you the density which is in 3 dimensions and you only know two from the problem, length and height of the building. Overall, I'm just stumped which is weird for me.