\textbf{165-} A person of mass $80\ \text{kg}$ is inside an elevator. At the moment the elevator begins moving downward with constant acceleration $2\ \dfrac{\text{m}}{\text{s}^2}$, how many Newtons of force does the person exert on the elevator?
$$\left(g = 10\ \frac{\text{m}}{\text{s}^2}\right)$$
\begin{itemize}
\item[(1)] $960$ \hfill (2) $800$ \hfill (3) $160$ \hfill (4) $640$
\end{itemize}
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\textbf{Workspace for Calculations}
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