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## Homework Statement

An experimentalist has measured the u-velocity component of a two-dimensional flow

field. It is approximated by

u = (1/3)( xy) (y^2)

It is also known that the v-velocity is zero along the line y=0.

## Homework Equations

∇V=du/dx+dv/dy (partial derivatives)

## The Attempt at a Solution

The solution is found by setting du/dx+dv/dy=0 (partial derivatives), solving the differential equation and then using the boundary conditions at v=0, y=0 to find the constant.

How can we set the velocity gradient equal to zero? Why is it safe to assume that there is no velocity gradient?