$A$ simple pendulum has a length of $75 \, cm$. It describes a vertical semi-circle. What will be the velocity of the bob when it passes through the mean position?
- A$\sqrt{7.4} \, m/s$
- B$\sqrt{14.7} \, m/s$
- C$\sqrt{22.2} \, m/s$
- D$\sqrt{29.6} \, m/s$
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