$($II$)$ Three masses are hung over two pulleys, as shown in

Fig. $5\mathrm{.}58.$ The pulleys are massless and frictionless. As$-$

sume that $m_1>(m_2+m_3)$ and $m_2>m_3.($a$)$ Show that the

tension in the rope supporting the fixed pulley is

$T=\frac{16m_1{m}_2{m}_{3}g}{m_1(m_2+m_3)+4m_2{m}_3}$

$($b$)$ Identify the mass that has the following acceleration:

$a=\frac{[m_1(m_2+m_3)-4m_2{m}_3]g}{m_1(m_2+m_3)+4m_2{m}_3}$