If speed of a particle moving in a circle of radius $2\,m$ is given as $v = 2t + 2$, then its centripetal acceleration after $1\, s$ will be   ......... $m/s^2$

  • A

    $8$

  • B

    $4$

  • C

    $2$

  • D

    $\sqrt {68}$

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  • [AIEEE 2012]