$.(20)$There are $2$infinitely large plates parallel to$$xy$-$plane and water flows between them.

The both plates are moving with constant velocity: vec$($V$)$upper$=($Vx$,$Vy$,0)$and vec$($V$)$lower$=$

$(-$Vx$,-$Vy$,0).$Additionally$,$ there is $$a constant pressure gradient in$$x $$and y $$directions:

gradp$=($delpdelx$,$delpdelx,$0).$Assuming steady, incompressible, and the negligible gravity, answer the

following questions:

au$,$v$,$and w $$fields with given variables.

bx $$and y $$directions with corresponding velocities. Why can you use

linearity even though the governing equations are non$-$linear? solve clearly please