Velocity distribution in a boundary layer is given by \(\;\frac{u}{{ U \infty }} = sin\left( {\frac{\pi }{2}\frac{y}{\delta }} \right)\),where u is the velocity at vertical coordinate y, ∪∞ is the free stream velocity and δ is the boundary layer thickness. The values of ∪∞ and δ are 0.3 m/s and 1.0 m, respectively. The velocity gradient \(\left( {\frac{{\partial u}}{{\partial y}}} \right)\) (in s-1, round off of two decimal places) at y = 0, is
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