Usaha dan Energi Pembahasan Soal 1

Usaha

\begin{equation*}
\begin{split}
W & = \text{Luas 1} - \text{Luas 2} \\\\
W & = (\tfrac{1}{2} \:.\: (6 + 4) \:.\: 8) - \left(\tfrac{1}{2} \:.\: 1 \:.\: (2)\right) \\\\
W & = 40 - 1 \\\\
W & =39 \text{ J}
\end{split}
\end{equation*}

Usaha dan energi kinetik

\begin{equation*}
\begin{split}
W & = \Delta E_k \\\\
W & = \tfrac{1}{2} \:.\: m \:.\: (v_t^2 - v_o^2) \\\\
39 & = \tfrac{1}{2} \:.\: 2 \:.\: (v_t^2 - 5^2) \\\\
64 & = v_t^2 \\\\
8 \text{ m/s} & = v_t
\end{split}
\end{equation*}