Problem $1$

A fluid flow is described by the velocity field,

$u=\frac{5y}{x^2+y^2}$

$v=\frac{-5x}{x^2+y^2}$

where $x,y$ are in $m$ and $u,v$ are in $\frac{m}{s}.$ What is the numerical value for the acceleration vector at the point $x=1,y=2?$