Air $ (p=1.2\;kg/m^3 $ and kinematic viscosity , $ v=2\times10^{-5}m^2/s) $ with a velocity of 2 m/s flows over the top surface of a flat plate of length 2.5 m . If the average value of friction coefficient is , the total drag force (in N) per unit width of the plate is _____.
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