9-35 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} \vec r(t\ut{s})&=(3500-160t)\i+2700\j+300\k\ut{m}\\ m&=250\ut{kg} \end{cases} $$ $$ \begin{aligned} \vec v&=\dyt{\vec r}\\ &=-160\i\ut{m/s} \end{aligned} $$ $$\ab{a}$$ $$ \begin{aligned} \vec p&=m\vec v\\ &=-40000\i\ut{kg\cdot m/s}\\ \end{aligned} $$ $$\ab{b}$$ $$ \begin{aligned} \vec v&=-160\i\ut{m/s}, \end{aligned} $$ $$\text{West}$$ $$\ab{c}$$ $$ \begin{aligned} \vec F&=m\vec a\\ &=m\dyt{\vec v}\\ &=0 \end{aligned} $$