The motion of a particle along a straight line is described by equation $x = 8 + 12t -t^3$ where $x$ is in metre and $t$ in second. The retardation of the particle when its velocity becomes zero is.......$ms^{-2}$

  • A

    $6$

  • B

    $12$

  • C

    $24$

  • D

    $0$

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