The windward roof on the house is 20 m wide and is subjected to the wind as shown. If the average absolute pressure on the top of the roof is 3 kPa, and under the roof, that is, within the attic, it...

The windward roof on the house is 20 m wide and is subjected to the wind as shown. If the average absolute pressure on the top of the roof is 3 kPa, and under the roof, that is, within the attic, it is 2 kPa, determine the pressure drag on the windward side of the roof.