If a cycle wheel of radius $4 \, m$ completes one revolution in two seconds,then the acceleration of a point on the rim of the cycle wheel will be:
- A${\pi ^2} \, m/s^2$
- B$2{\pi ^2} \, m/s^2$
- C$4{\pi ^2} \, m/s^2$
- D$8{\pi ^2} \, m/s^2$
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