Convert a velocity of $72 \mathrm{kmh}^{-1}$ into $\mathrm{ms}^{-1}$ with the help of dimensional an

Question

Convert a velocity of $72 \mathrm{kmh}^{-1}$ into $\mathrm{ms}^{-1}$ with the help of dimensional analysis.

Professor PC Thomas Classes · Answer

$72 	ext{ km/h} = 72 	imes \frac{5}{18} 	ext{ m/s} = 20 	ext{ m/s}$.