The velocity of a particle moving in the positive direction of the $x$-axis varies as $v = 5 \sqrt{x}$. Assuming that at $t = 0$,the particle was at $x = 0$,what is the acceleration of the particle in $m/s^2$?

  • A
    $12.5$
  • B
    $7.5$
  • C
    $5$
  • D
    $2.5$

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