Question

The velocity of a car is 18 ms-1. Express this velocity in kmh-1.​

Answer 1

Velocity of the car is 18 m/s.

We know that,

$1 \: \dfrac{km}{hr} = \dfrac{5}{18} \: \dfrac{m}{s} \\ \\ 1 \times \dfrac{18}{5} \dfrac{km}{hr} = 1 \: \dfrac{m}{s} \\ \\ 1 \: \dfrac{m}{s} = \dfrac{18}{5} \: \dfrac{km}{hr} \\ \\ 18 \: \dfrac{m}{s} = 18 \times \dfrac{18}{5} \: \dfrac{km}{hr} \\ \\ = \dfrac{324}{5} \: \dfrac{km}{hr} \\ \\ velocity = 64.8 \: \dfrac{km}{hr}$