2-26 할리데이 10판 솔루션 일반물리학

$$\begin{cases} v_0 &= 6.00\times10^6\ut{m/s} \\ a &= -1.25\times10^{14}\ut{m/s^2} \\ v &= 0 \end{cases}$$
(a) $$S =?$$ $$2aS = v^2-v_0^2 ,$$ $$\begin{aligned} \Ans &= S = \frac{v^2-v_0^2}{2a} \\ &= \frac{0^2-(6.00\times10^6\ut{m/s})^2}{2(-1.25\times10^{14}\ut{m/s^2})} \\ &= \frac{18}{125}\ut{m} \\ &= 0.144\ut{m} = 14.4\ut{cm} \end{aligned}$$
(b) $$\begin{aligned} x(t) &= v_0t+\frac{1}{2}at^2 \\ &= (6.00\times10^6)t+\frac{1}{2}(-1.25\times10^{14})t^2 \\ &= (6.00\times10^6)t+(-6.25\times 10^{13})t^2 \end{aligned}$$ $$\begin{aligned} v(t) &= \dot x = \dxt{x} \\ &= \dt\{ (6.00\times10^6)t+(-6.25\times 10^{13})t^2 \} \\ &= 6.00\times10^6 - (1.25\times10^{14})t \end{aligned}$$

x(t)

v(t)