Hubungan Usaha dan Energi

\begin{equation*}
\begin{split}
W & = \Delta EK \\\\
W & = EK_2 - EK_1 \\\\
W & = \tfrac{1}{2} \:.\: m \:.\: (v_2^2 - v_1^2) \\\\
W & = \tfrac{1}{2} \:.\: 800 \:.\: (20^2 - 10^2) \\\\
W & = 120.000 \text{ J}
\end{split}
\end{equation*}