2-37 할리데이 10판 솔루션 일반물리학

$$ \begin{cases} x_0 &= -2\ut{m} \\ x_1 &= 0 \\ x_2 &= 6.0\ut{m} \\ t_x &= x\ut{s} \\ a &= \Cons \end{cases}$$ $$\vec{a} =? $$ $$\text{(Make System of Equations)}$$ $$ \Delta x = \overset{x}{v_0}t+\frac{1}{2}\overset{y}{a}t^2, $$ $$\text{(OverSet x,y Means Unknown Value)} $$ $$ \begin{cases} \Delta x_{0 \to 1} &= \overset{x}{v_0}t_{0 \to 1}+\frac{1}{2}\overset{y}{a}t_{0 \to 1}^2 \\ \Delta x_{0 \to 2} &= \overset{x}{v_0}t_{0 \to 2}+\frac{1}{2}\overset{y}{a}t_{0 \to 2}^2 \end{cases}$$ $$ \begin{cases} 0 - (-2) &= \overset{x}{v_0}(1)+\frac{1}{2}\overset{y}{a}(1)^2 \\ 6 - (-2) &= \overset{x}{v_0}(2)+\frac{1}{2}\overset{y}{a}(2)^2 \end{cases}$$ $$ a = +4\ut{m/s^2} $$
(a) $$ |a| = 4\ut{m/s^2} $$
(b) $$ a = +x \, \text{Direction} $$