The distance-time graph of a particle at time $t$ makes an angle of $45^{\circ}$ with the time axis. After one second,it makes an angle of $60^{\circ}$ with the time axis. What is the average acceleration of the particle?

  • A
    $\sqrt{3}-1$
  • B
    $\sqrt{3}+1$
  • C
    $\sqrt{3}$
  • D
    $1$

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