5-33 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} v_0&=5.0\times10^6\ut{m/s}\\ d&=1.0\times10^{-14}\ut{m}\\ m&=1.67\times10^{-27}\ut{kg}\\ \end{cases} $$ $$2aS=v^2-{v_0}^2,$$ $$F=ma,$$ $$ \begin{aligned} -F&=ma\\ &=m\br{v^2-{v_0}^2\over2S}\\ &=m\br{0^2-{v_0}^2\over2d}\\ &=-{m{v_0}^2\over2d}\\ \end{aligned} $$ $$ \begin{aligned} F&=\frac{167}{80}\ut{N}\\ &=2.0875\ut{N}\\ &\approx 2.1\ut{N}\\ \end{aligned} $$