5-30 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} \vec v&=17\i-23\j\ut{m/s}\\ \vec F_1&=4.0\i+5.0\j-6.0\k\ut{N}\\ \vec F_2&=-6.0\i+7.0\j-3.5\k\ut{N}\\ \end{cases} $$ $$\Sigma \vec F=0 \Harr \Delta \vec v=0 $$ $$ \begin{aligned} \vec F_3 &= -\vec F_1-\vec F_2\\ &=2.0\i-12\j+9.5\k\ut{N} \end{aligned} $$