8-16 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} m&=0.30\ut{kg}\\ v&=4.00\ut{m/s}\\ h_{\max}&=0.80\ut{m}\\ g&=9.80665\ut{m/s^2} \end{cases} $$ $$ \put \begin{cases} \KE : \text{Kinetic Energy}\\ \GE : \text{Gravitational Potential Energy}\\ \end{cases} $$ $$ \begin{aligned} \Delta E &=E_2-E_1\\ &=\GE_2-\KE_1\\ &=mgh_2-\frac{1}{2}m{v_1}^2\\ &=\frac{6 g}{25}-\frac{12}{5}\\ &=-0.046404\ut{J}\\ &=-4.6404\times10^{-2}\ut{J}\\ &\approx -4.64\times10^{-2}\ut{J}\\ &\approx -46.4\ut{mJ}\\ \end{aligned} $$