I need your help to solve this problem.A circular pipe with radius $R=3\mathrm{.}1[m]$ carries a fluid with a velocity distribution given by the parabolic function:

$v(r)=K*(R^2-r^2),[\frac{m}{s}]$

Where $r$ is the radial distance from the center of the pipe and $K=4\mathrm{.}7$ is a constant. Compute the discharge $Q$ through the pipe in $\frac{m^3}{s}.$