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Physics

18 km h-1 is equal to —

  1. 10 m s-1
  2. 5 m s-1
  3. 18 m s-1
  4. 1.8 m s-1

Motion in One Dimension

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Answer

5 m s-1

Reason — As,

18 kmh−1=18kmh=18×1000 m60×60 s=18×10 m6×6 s=180 m36 s=5 m s−118 \text{ kmh}^{-1} = 18 \dfrac{\text{km}}{\text{h}} \\[1em] = \dfrac {18 \times 1000\ \text m}{60 \times 60\ \text s} \\[1em] = \dfrac {18 \times 10 \text{ m}}{6 \times 6 \text{ s}} \\[1em] = \dfrac {180 \text{ m}}{36 \text{ s}} \\[1em] = 5 \text{ m s}^{-1}

Hence, 18 km h-1 is equal to 5 m s-1.

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