Two parallel plates kept $0\mathrm{.}1$m apart have a laminar flow of oil between them with a maximum velocity of $1\mathrm{.}5$m$/$s$.$ Calculate the discharge per metre width, the shear stress at the plate, and the difference in pressure in Pascal between two points $20$m apart, the velocity gradient at the plates and velocity at $0\mathrm{.}02$m from the bottom plate. Take viscosity of oil to be $2\mathrm{.}45$Ns$/$m$2.$