What flows steadily through a reducing pipe section. The flow upstream with a radius of R1 is laminar with a velocity profile of u1(r)=u02(1-r2/R12) while the flow downstream is turbulent with a velocity profile of u2(r)=u02(1-r/R2)1/7. For incompressible flow with R2/R1=4/7, determine the ratio of centerline velocities u02/u01