[tex]pt.m_2:\vec{G_2}+\vec{T_2}=0\\Ox:m_2g-T_2=0\\pt.m_1:\vec{N}+\vec{G_1}+\vec{F_f}+\vec{T_1}=0\\Ox:T_1-m_1gsin\alpha-F_f=0\\Oy:N-m_1gcos\alpha=0=>N=m_1gcos\alpha\\F_f=\mu N=\mu m_1gcos\alpha=\frac{2}{\sqrt{3}}*\frac{\sqrt3}{2}*2*10=20 N=>F_f=20N \\T_1-m_1gsin\alpha-m_1gcos\alpha=0<=>T_1-2*10*0,5-20=0<=>T_1=10N\\T_2=\frac{T_1}{2} =\frac{10}{2}=5 N=>T_2=5 N\\ m_2g-T_2=0=>m_2=\frac{T_2}{g}=\frac{5}{10}=0,5 kg=>m_2=0,5 kg\\[/tex]
[tex]sin\alpha=\frac{h}{l}=>l=\frac{h}{sin\alpha}=\frac{60}{0,5}= 120 cm=>h=120 cm[/tex]
