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PRACTICE / Unit conversion

A speedometer meets the SI system

A vehicle moves at 54 km/h.

Express its speed in m/s.

Organize the givens & assumptions
  • 1 km = 1000 m
  • 1 h = 3600 s

Exact metric and clock conversions; speed is distance divided by elapsed time.

  1. A15 m s−115\ \mathrm{m\,s^{-1}}
  2. B194.4 m s−1194.4\ \mathrm{m\,s^{-1}}
  3. C54 m s−154\ \mathrm{m\,s^{-1}}
  4. D1.5 m s−11.5\ \mathrm{m\,s^{-1}}

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