Solució: \begin{align} &\cssId{Step1}{∑ F_{v}= 0} \\[3px] &\cssId{Step2}{Tsin(30)-m·g+F_{v}= 0} \\[3px] &\cssId{Step3}{F_{v} = \frac{3·m·g}{4}} \\[3px] \end{align}