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Time and Speed

18 kmh-1 is e...

Question

18 km $h^{- 1}$ is equal to :

(a) $10 m s^{- 1}$ (b) $5 m s^{- 1}$

(c) $18 m s^{- 1}$ (d) $1.8 m s^{- 1}$

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Solution

As we know

$1 fraction numerator k m over denominator h r end fraction equals 1000 over 3600 bevelled m over s 1 fraction numerator k m over denominator h r end fraction equals 5 over 18 bevelled m over s s o 18 fraction numerator k m over denominator h r end fraction equals 18 5 over 18 bevelled m over s equals 5 m s to the power of negative 1 end exponent$

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