A particle's position along the x$-$axis is given by the equation;

x$($t$)=2$t$33$t$2+4$x$($t$)=2$t$33$t$2+4$

where xx is in meters and tt is in seconds. What is this particles average acceleration between t$=0$st$=0$s and$$t$=2$st$=2$s$?$

Please express your answer with zero decimal places in units of m$/$s$2.$