$A$ particle moves in a straight line and its position $x$ at time $t$ is given by $x^2 = 2 + t$. Its acceleration is given by

  • A
    $- \frac{2}{x^3}$
  • B
    $- \frac{1}{4x^3}$
  • C
    $- \frac{1}{4x^2}$
  • D
    $\frac{1}{x^2}$

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