If the speed of a car is $5 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ?
18

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Solution

The correct option is A 18
Given:
Speed of a car $= 5 m s^{- 1}$ $= \frac{5 m}{1 s}$
We know that $1 k m h^{- 1} = \frac{1000}{3600} m s^{- 1} = \frac{5}{18} m s^{- 1}$
So inorder to convert $m s^{- 1}$ in to $k m h^{- 1}$ , we need to multiply $m s^{- 1}$ with $\frac{18}{5}$ .
$\Rightarrow 5 m s^{- 1} = 5 \times \frac{18}{5} = 18 k m h^{- 1}$
$∴ 5 m s^{- 1} = 18 k m h^{- 1}$

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