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}