A $65-$kg woman descends in an elevator that briefly accelerates at $0\mathrm{.}20$g$.$She stands on a scale that reads in N$.($a$)$During this acceleration, what is her weight and what does the scale read? $($b$)$What does the scale read when the elevator descends at a constant speed of $2\mathrm{.}0$m$/$s$?$Where did the $0\mathrm{.}8$mg come from?