\textbf{187-} An object of mass $0.5\ \text{kg}$ is attached to a light spring with constant $200\ \frac{\text{N}}{\text{m}}$, placed on a horizontal frictionless surface and oscillates. If the amplitude is $5\ \text{cm}$, what is the speed of the oscillation center in meters per second?
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(1) $0.8$ \hspace{2cm} (2) $1.6$ \hspace{2cm} (3) $2.4$ \hspace{2cm} (4) $3.6$
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