$A$ particle is moving in a circle of radius $5 \,cm$ with uniform speed and completes the circle in $5 \,s$. What is the magnitude of linear acceleration?
- A$0.8 \pi^2 \,cm / s^2$
- B$0.8 \pi^2 \,m / s^2$
- C$0.8 \pi \,cm / s^2$
- D$0.8 \pi \,m / s^2$
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