LaTeX
\begin{equation} \left(40kg\right)\left(9.81\frac{m}{s^{2}}\right)\sin 30=WA\\ \end{equation}\begin{equation} ma=\frac{\left(40kg\right)\left(9.81\frac{m}{s^{2}}\right)\sin 30}{9.81\frac{m}{s^{2}}}\\ \end{equation}\begin{equation} ma=20\\ \end{equation}