$18)$ An object moves from x $=-5$ m$,$ y $=6$ m to x $=6$ m$,$ y$=-4$ m in a time of $2$ s$.$ What is

its average velocity?

$(1\mathrm{.}75$ m$/$s$)-(1\mathrm{.}5$ m$/$s$)$

$(5\mathrm{.}5$ m$/$s$)-(5$ m$/$s$)$j

$(21\mathrm{.}4$ m$/$s$)$i $-(20$ m$/$s$))$

$(3$ m$/$s$)$i $-(2\mathrm{.}67$ m$/$s$)$j

$(13$ m$/$s$)$i $-(12$ m$/$s$)$j