9.8 Air at 5 m/s, atmospheric pressure, and 20 C flows over both sides of a flat plate that is 0.8 m long and 0.3 m wide. Determine the total drag force on the plate. Determine the total drag force when the single plate is replaced by two plates each 0.4 m long and 0.3 m wide. Explain why there is a difference in the total drag even though the total surface area is the same.