Oil $($specific gravity, a $=0\mathrm{.}78)$ is pumped along a $0\mathrm{.}95$m diameter horizontal pipe at a fiow rateof $2450$kg$/$s and temperature of $18\mathrm{.}1\backslash$deg C$.$ Take the kinematic viscosity $=0\mathrm{.}001$ m$?/$s$,$ andreference density $($Po$)=997$kg$/$m$3.$a$)$ Calculate the average velocity of the oil.