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A point P moves in counter-clockwise direction on a circular path as shown in the figure. The movement of $'P'$ is such that it sweeps out a length $s = t^3 +5$, where $s$ is metres and $t$ is in seconds. The radius of the path is $20 \;m$. The acceleration of $'P'$ when $t = 2\;s$ is nearly <br> <img src=""/>

( A ) $14 \; m/s^2$
( B ) $12\;m/s^2$
( C ) $13\; m/s^2$
( D ) $7.2 \;m/s^2$

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