Question

a car drove on a straight road and got the distance of 72km in one hour. calculate the speed of the car in meters per second.

Answer 1

Given that the distance is d = 72 km and the time is t = 1 hour.

We have to find the speed in m/s.

First, we have to convert the unit of distance in m and the unit of time in seconds.

The distance will be

`\begin{gathered} d=72*1000\text{ m} \\ =72000\text{ m} \end{gathered}`

The time will be

`\begin{gathered} t=\text{ 1}*60*60 \\ =3600\text{ s} \end{gathered}`

The speed can be calculated by the formula

`v=(d)/(t)`

Substituting the values, the speed will be

`\begin{gathered} v=(72000)/(3600) \\ =20\text{ m/s} \end{gathered}`

Thus, the speed of the car is 20 m/s