Consider two$-$dimensional, steady, incompressible flow through the plane converging channel shown as shown in Fig$\mathrm{.}1.$ The velocity on the horizontal centerline $(x-$axis$)$ is given by

vec$(V)=3\mathrm{.}0[1+(\frac{x}{L})]i^{?}$

Find an expression for the acceleration of a particle moving along the centerline using:

a$)$ the Eulerian approach.

b$)$ the Lagrangian approach.

Also, evaluate the acceleration when the particle is at the $x=0$ and $x=L.$