I don't know how to solve this problem

(10 pts) Consider steady flow of water through an axisymmetric garden hose nozzle. The axial ( z ) component of velocity increases linearly from uz,entrance to uz,exit, so that between z=0 and z=L the axial velocity component is given by: uz=uz,entrance+[(uz,exituz,entrance)/L]z Generate an expression for the radial velocity component ur between z=0 and z=L. You may ignore frictional effects on the walls and assume that ur only depends on r. Note: In this case, we should end up with a velocity field that is valid throughout the nozzle What does the integration constant have to be for this to be the case