$4\mathrm{.}2\mathrm{.}14$ WP A constant$-$density fluid flows through a converging sec$-$

tion having an area A given by

$A=\frac{A_0}{1+(\frac{x}{l})}$

where $A_0$ is the area at $x=0.$ Determine the velocity and acceleration

of the fluid in Eulerian form and then the velocity and acceleration of

a fluid particle in Lagrangian form. The velocity is $V_0$ at $x=0$ when

$t=0.$