EXAMPLE $1-$SHEAR STRESS

The space between two plates, as shown in the figure, is filled with water. Find the shear stress and the force necessary to move the upper plate at a constant velocity of $10\frac{m}{s}.$ The gap width is $y_0=0\mathrm{.}1mm$ and the area $A$ is $0\mathrm{.}2m^2.$ The viscosity of water is $0\mathrm{.}001$ Pa$.$s$.$