The coordinates of a moving particle at any time $t$ are given by $x = \alpha t^3$ and $y = \beta t^3$. The speed of the particle at time $t$ is given by

  • A
    $\sqrt{\alpha^2 + \beta^2}$
  • B
    $3t\sqrt{\alpha^2 + \beta^2}$
  • C
    $3t^2\sqrt{\alpha^2 + \beta^2}$
  • D
    $t^2\sqrt{\alpha^2 + \beta^2}$

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