Problem $2(5$ marks$)$

The velocity distribution of a Newtonian liquid with dynamic viscosity $=1\mathrm{.}0N\frac{s}{m^2}$ Fowing over a fixed plate is given by $u=0\mathrm{.}75y^3,$ where $u$ is the velocity in $\frac{m}{s}$ and is the distance from the plate in $m.$ What are the shear stresses at the plate surface, nd at $y=0\mathrm{.}40.$