$A$ grinding wheel attains a velocity of $20 \ rad/s$ in $5 \ s$ starting from rest. Find the number of revolutions made by the wheel.
- A$\frac{\pi}{25} \text{ revolutions}$
- B$\frac{1}{\pi} \text{ revolutions}$
- C$\frac{25}{\pi} \text{ revolutions}$
- D$\text{None of these}$
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