At time t$,$vec$($r$)=7\mathrm{.}10$t$^(2)$hat$($i$)-(5\mathrm{.}20$t$+2\mathrm{.}30$t$^(2))$hat$($j$)$ gives the position of a $3\mathrm{.}0$ kg particle relative to the origin of an xyvec$($r$)$ is in

meters and t is in seconds