For airflow over a flat plate, velocity (U) and boundary layer thickness (δ) can be expressed respectively, as If the free stream velocity is 2 m/s, and air has Kinematic viscosity of 1.5×10−5 m^2/s and density of 1.23 kg/m^3, then wall shear stress at x = 1 m, is ______
A. 2.36×102 N/m^2
B. 43.6×1