A particle is executing simple harmonic motion. If the force acting on the particle at a position is 86.6% of the maximum force on it, then the ratio of its velocity at that point and its maximum velocity is
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Common SHM values: At $x = \frac{\sqrt{3}}{2}A$, $v = \frac{1}{2}v_{max}$. At $x = \frac{1}{2}A$, $v = \frac{\sqrt{3}}{2}v_{max}$. Energy partitions similarly.