Seawater has density $1,025$k$($g$)/($m$^(3))$ and flows in a velocity field v$=$yi$+$xj$,$ where x$,$y$,$ and z are measured in meters and the components of vk$($g$)/($s$)$ x$^(2)+$y$^(2)+$z$^(2)=64,$z$>=0.$

k$($g$)/($s$)$