If $x, v$ and $a$ denote the displacement,the velocity and the acceleration of a particle executing simple harmonic motion of time period $T$,then,which of the following does not change with time?

  • A
    $a^2T^2 + 4\pi^2v^2$
  • B
    $\frac{aT}{x}$
  • C
    $aT + 2\pi f$
  • D
    $\frac{aT}{v}$

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