$($a$)$ Define the following terms $($a$)$ Define the following terms

$($i$)$ Incompressible flow condition $($ii$)$ Steady and Uniform flows $($iii$)$ Displacement

thickness $($iv$)$ Assumptions of Navier$-$Stocks Equation $($v$)$ Drag force and flow separation

$($i$)$ Incompressible flow condition $($ii$)$ Steady and Uniform flows $($iii$)$ Displacement

thickness $($iv$)$ Assumptions of Navier$-$Stocks Equation $($v$)$ Drag force and flow separation