Convert $9\text{km/hr}$ into $\text{m/s}$.

To convert speed from kilometers per hour ($\text{km/hr}$) to meters per second ($\text{m/s}$), we multiply the given numerical value by $\frac{5}{18}$:
$$\text{Speed in m/s}=9\times \frac{5}{18}$$

$$\text{Speed in m/s}=\frac{45}{18}=2.5\text{m/s}$$