A particle initially at rest starts moving from reference point. $\mathrm{x}=0$ along $\mathrm{x}$-axis, with velocity $v$ that varies as $v=4 \sqrt{\mathrm{x} m} / \mathrm{s}$. The acceleration of the particle is __________$ \mathrm{ms}^{-2}$.

  • [JEE MAIN 2024]
  • A

    $7$

  • B

    $8$

  • C

    $9$

  • D

    $10$

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