$A$ particle performing uniform circular motion of radius $\frac{\pi}{2} \ m$ makes $x$ revolutions in time $t$. Its tangential velocity is
- A$\frac{\pi x}{t}$
- B$\frac{\pi x^2}{t}$
- C$\frac{\pi^2 x^2}{t}$
- D$\frac{\pi^2 x}{t}$
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