2-41 할리데이 10판 솔루션 일반물리학

$$v_0 = 64\ut{m/s}$$
(a)$a=?$ $$\begin{cases} a = \Cons \\ t = 3.0\ut{s} \\ v = 0 \\ \end{cases}$$ $$v = v_0+at,$$ $$\begin{aligned} a &= \frac{v-v_0}{t}\\ &= \frac{0-64\ut{m/s}}{3.0\ut{s}}\\ &= -\frac{64}{3}\ut{m/s^2}\\ &\approx -21.33333333333333\ut{m/s^2}\\ &\approx -21\ut{m/s^2}\\ \end{aligned}$$
(a)$x_i=0, \Delta x=?$ $$\begin{aligned} \Delta x &= \frac{1}{2}(v+v_0)t,\\ &= \frac{1}{2}(0+64\ut{m/s})(3.0\ut{s})\\ &=96\ut{m}\\ \end{aligned}$$