2-69 할리데이 10판 솔루션 일반물리학

$$ x(16)-x(0) =?$$ $$ \begin{aligned} \Ans &= \int_0^{16}v\dd t\\ &= \int_0^2v\dd t+\int_2^{10}v\dd t+\int_{10}^{12}v\dd t+\int_{12}^{16}v\dd t\\ &=\frac{1}{2} \cdot 2 \cdot 8 + 8 \cdot 8+\frac{1}{2} \cdot 2 \cdot (8+4)+4\cdot4\\ &= 100\ut{m} \end{aligned} $$