2-46 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} t&=2\ut{h}+41\ut{min}\\ \Delta x &= 3.90\ut{m}\\ \end{cases} $$ $$ \begin{aligned} t&=2\ut{h}+41\ut{min}\\ &=120\ut{min}+41\ut{min}\\ &=161\ut{min} \end{aligned} $$ $$ \begin{aligned} \bar v&=\frac{\Delta x}{t}\\ &=\frac{390\ut{cm}}{161\ut{min}}\\ &=\frac{390}{161}\ut{cm/min}\\ &\approx 2.422360248447205\ut{cm/min}\\ &\approx 2.42\ut{cm/min}\\ \end{aligned} $$