Question

2. Change the units of the following speeds as
indicated:
(a) 72 km/h into m/s

Answer 1

Answer:

multiple 5/18. karo .............

Answer 2

We know,

$\mathrm{1\ km=10^3\ m}\\\\\mathrm{1\ h=36\times 10^2\ s\quad\implies\quad1\ h^{-1}=36^{-1}\times 10^{-2}\ s^{-1}}$

Hence,

$\mathrm{72\ kmh^{-1}=72\times 10^3\times 36^{-1}\times 10^{-2}\ ms^{-1}}\\\\\mathrm{72\ kmh^{-1}=2\times 10\ ms^{-1}}\\\\\mathrm{72\ kmh^{-1}=20\ ms^{-1}}$