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The \( x \)-t graph of a particle undergoing simple harmonic motion is shown below. The acceleration of the particle at
\( \mathrm{P} \) \( t=4 / 3 \mathrm{~s} \) is
[IIT-JEE 2009]
(a) \( \frac{\sqrt{3}}{32} \pi^{2} \mathrm{~cm} / \mathrm{s}^{2} \)
(b) \( \frac{-\pi^{2}}{32} \mathrm{~cm} / \mathrm{s}^{2} \)
(c) \( \frac{\pi^{2}}{32} \mathrm{~cm} / \mathrm{s}^{2} \)
(d) \( -\frac{\sqrt{3}}{32} \pi^{2} \mathrm{~cm} / \mathrm{s}^{2} \)
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