2-38 할리데이 11판 솔루션 일반물리학

$$\begin{aligned} S&=\frac{1}{2}(v+v_0)t,\\ &=\frac{1}{2}(15+30)5\\ &=\frac{225}{2}\ut{m}\\ &=112.5\ut{m}\\ &\approx1.1\times10^2\ut{m} \end{aligned}$$