5-49 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} N_a&=20.0\ut{N}\\ N_b&=10.0\ut{N}\\ \Sigma m&=15.0\ut{kg} \end{cases} $$ $$\Sigma \vec F = m\vec a,$$ $$ \begin{cases} \Sigma F_{aA} &= m_{aA} a_{aA}\\ \Sigma F_{aB} &= m_{aB} a_{aB}\\ \Sigma F_{bB} &= m_{bB} a_{bB}\\ \Sigma F_{bA} &= m_{bA} a_{bA}\\ \end{cases} $$ $$ \begin{cases} \Sigma F_{aA} &= m_{A} a_{a}\\ \Sigma F_{aB} &= m_{B} a_{a}\\ \Sigma F_{bB} &= m_{B} a_{b}\\ \Sigma F_{bA} &= m_{A} a_{b}\\ \end{cases} $$ $$ \begin{cases} F_a-N_a &= m_{A} a_{a}\\ N_a &= m_{B} a_{a}\\ F_a-N_b &= m_{B} a_{b}\\ N_b &= m_{A} a_{b}\\ \end{cases} $$ $$\ab{a}$$ $$ \begin{cases} a_a&=2.00\ut{m/s^2}\\ a_b&=2.00\ut{m/s^2} \end{cases} $$ $$\ab{b}$$ $$ \begin{aligned} F_a&=30.0\ut{N} \end{aligned} $$