$8.$ Sally is a downhill skier on the Breckenridge State College ski team. She is performing some practice runs on a green trail$($easiest difficulty$)$ while the biomechanics class is recording the digital video for a lab assignment. The coordinates of Sally$$s center of mass $($COM$)$ at the top of the hill at the start of each run are $(1\mathrm{.}23$units, $42\mathrm{.}86$units$)$ and at the bottom of the hill at the end of each run are $(428\mathrm{.}40$units, $5\mathrm{.}51$units$).$ At the end of each run, Salley travels the same distance back up to her starting position using the chair lift. The field of view of the cameras was calibrated to be $10$m$=1\mathrm{.}34$units. A$)$ What is Sally$$s displacement after starting at the top of the hill and completing $5$ runs$($down$,$ up$,$ down, up$,$ down, up$,$ down, up$,$ down$)?$

B$)$ What is Salley$$s average resultant velocity if it takes her $102\mathrm{.}1$s to complete one run down the