5-6 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} m&=4.00\ut{kg}\\ \vec a &= -8.00\i+9.00\j\ut{m/s^2}\\ \vec F_1 &=30.0\i+16.0\j\ut{N}\\ \vec F_2 &=-6.00\i+8.00\j\ut{N}\\ \end{cases} $$ $$ \begin{aligned} \Sigma \vec F &= m\vec a,\\ \vec F_3&=m\vec a-(\vec F_1+\vec F_2)\\ &=-56.0\i+12.0\j\ut{N} \end{aligned} $$