2-27 할리데이 10판 솔루션 일반물리학

$$\begin{cases} v_0 &= 0 \\ a &= \Cons \\ t &= 5.00\ut{ms} = 0.005\ut{s} \\ S &= 2.00\ut{cm} = 0.02\ut{m} \end{cases}$$ $$a =?$$ $$\begin{aligned} S &= v_0t+\frac{1}{2}at^2 \\ &= \frac{1}{2}at^2 (\because v_0=0) \end{aligned}$$ $$\begin{aligned} \Ans &= a = \frac{2S}{t^2} \\ &=\frac{2(0.02\ut{m})}{(0.005\ut{s})^2} \\ &= 8.00\ut{m/s} \end{aligned}$$