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**Hint:**we are asked to convert the given value of speed in km/h to m/s. To convert this we need to know the value of 1 kilometer in meters and the value of 1 hour in seconds. Knowing this we can convert km/h into m/s.

**Complete step-by-step answer:**

In the question we are given a car which is moving with a speed of 72 km/h.

We are asked to calculate the car’s speed in m/s.

We know that 1 kilometer is 1000 m.

Hence to convert kilometers into meters we need to multiply the value in kilometers with 1000.

We also know that 1 hour is 60 minutes and 60 minutes is $60\times 60=3600\sec $. Hence to convert hour to meter we need to multiply the value in hour with 3600.

Therefore to convert km/h into m/s we need to multiply the value in km/h with $\dfrac{1000}{3600}$.

Thus in this case we have the speed of the car as, 72 km/h.

Therefore to calculate the speed in m/s we need to multiply 72 km/h with $\dfrac{1000}{3600}$.

i.e. $72km/h=72\times \dfrac{1000}{3600}$

$\Rightarrow 72km/h=20m/s.$

Hence the speed of the car in m/s is 20.

**Note:**Here we multiply the value in km/h with $\dfrac{1000}{3600}$.

We know that $\dfrac{1000}{3600}$ can be simplified into $\dfrac{5}{18}$.

Therefore instead of multiplying the given value in km/h with $\dfrac{1000}{3600}$ we can simply multiply that value with $\dfrac{5}{18}$.

By doing this also we get the same solution.

Considering the given case in this form, we can write

$72km/h=72\times \dfrac{5}{18}$

$\Rightarrow 72km/h=20m/s$.

Hence by multiplying with $\dfrac{5}{18}$ also we can convert km/h into m/s.

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