A rock thrown with speed $8\mathrm{.}00$ m$/$sm$/$s and launch angle $30\mathrm{.}0($above the horizontal$)$ travels a horizontal distance of dd $=18\mathrm{.}5$ mm before hitting the ground. From what height was the rock thrown? Use the value gg $=9\mathrm{.}800$ m$/$s$2$m$/$s$2$ for the free$-$fall acceleration.Find the height yiyi from which the rock was launched.