km/h is a unit of speed, read "kilometres per hour." An object travelling at a speed of 1 km/h would move 1 kilometre in one hour if the speed remained constant for that hour.
This unit is sometimes written kph, although in general this is casual rather than rigorous usage.
- 1 km/h = 0.278 m·s-1, the SI derived unit of speed
- 1 km/h = 0.621 mi/h = 0.911 ft/s
- 1 m/s = 3.6 km/h
Examples of speeds in km/h
|5 km/h||Walking speed|
|20 km/h||Easy bicycling speed|
|50 km/h||Residential speed limit|
|80-90 km/h||Speed limit on a major road|
|110-120 km/h||Highway speed|
|300 km/h||High-speed railroad|
|1000 km/h||Airliner cruising speed|
|40,320 km/h||Earth's escape velocity|