If $u=2x^2\frac{m}{s}$ and $v=-y\frac{m}{s},$ where $x$ and $y$ are in meters, determine the equation of the streamline that passes through point $(2m,6m),$ and find the acceleration of a particle at this point. Sketch this streamline for $x>0,$ and find the equations that define the $x$ and $y$ components of acceleration of the particle as a function of time if $x=2m$ and $y=6m$ when $t=0.$