Two masses $m_A=3.3 \mathrm{~kg}$ and $m_B=5.7 \mathrm{~kg}$ are on inclines $\left(\theta_A=55^{\circ}, \theta_B=27^{\circ}\right)$ and are connected together by a string as shown in figure. The coefficient of kinetic friction between each mass and its incline is $\mu=0.11$. If $m_A$ moves up, and $m_B$ moves down (careful!), determine their acceleration (in $\mathrm{m} / \mathrm{s}^2$ ). [Ignore the masses of the (frictionless) pulley and the cord.]
(NB: the acceleration is POSITIVE if in the same direction as $\vec{v}$ (green arrow), NEGATIVE otherwise)
