A particle leaves the origin with an initial velocity v$->=(6\mathrm{.}67$i$)$m$/$s

and a constant acceleration a$->=(3\mathrm{.}24$i $2\mathrm{.}81$j$)$m$/$s$2$

$.$ When the particle reaches its maximum x coordinate, what are $($a$)$ its velocity, $($b$)$ its position vector?