A vehicle moving with a speed of 18 km/h covers ...... m in 1s

The correct option is 5ms⁻¹.

To find the distance covered by the vehicle in 1 second, we need to convert its speed from kilometers per hour (km/h) to meters per second (m/s).

We know the relation between kilometers, meters, hours, and seconds is given by:
$1\text{km}=1000\text{m}$
$1\text{h}=3600\text{s}$

Therefore, the conversion factor to convert speed from km/h to m/s is:
$1\text{km/h}=\frac{1000\text{m}}{3600\text{s}}=\frac{5}{18}\text{m/s}$

Now, we convert the given speed of 18 km/h:
$\text{Speed}=18\times \frac{5}{18}\text{m/s}$
$\text{Speed}=5\text{m/s}=5{\text{ms}}^{-1}$

Thus, a vehicle moving with a speed of 18 km/h covers 5 meters in 1 second.