iran-konkur 2019 Q159

iran-konkur · Other · konkur-riazi_1398_specialized_new-curriculum Variable acceleration (1D) Find velocity/speed by differentiating position
159. According to the position–time graph below, the motion of the particle is uniform. The speed of the particle at moment $t = 8\,\text{s}$ is how many meters per second?
\begin{minipage}{0.45\textwidth} [Figure: $x$(m) vs $t$(s) graph. The curve starts at $x=0$, goes to a minimum near $t=4\,\text{s}$, then rises to $x=12$ and continues increasing in a parabolic (uniform acceleration) shape.] \end{minipage} \begin{minipage}{0.45\textwidth}
  • [(1)] $3$
  • [(2)] $4$
  • [(3)] $6$
  • [(4)] $12$
\end{minipage}
\textbf{159.} According to the position–time graph below, the motion of the particle is uniform. The speed of the particle at moment $t = 8\,\text{s}$ is how many meters per second?

\begin{minipage}{0.45\textwidth}
\textit{[Figure: $x$(m) vs $t$(s) graph. The curve starts at $x=0$, goes to a minimum near $t=4\,\text{s}$, then rises to $x=12$ and continues increasing in a parabolic (uniform acceleration) shape.]}
\end{minipage}
\hfill
\begin{minipage}{0.45\textwidth}
\begin{itemize}
    \item[(1)] $3$
    \item[(2)] $4$
    \item[(3)] $6$
    \item[(4)] $12$
\end{itemize}
\end{minipage}

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