$A$ particle is performing $U.C.M.$ along the circumference of a circle of diameter $50 \ cm$ with a frequency of $2 \ Hz$. The acceleration of the particle in $m/s^2$ is:
- A$2 \pi^2$
- B$4 \pi^2$
- C$8 \pi^2$
- D$\pi^2$
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