MILE and KILOMETRE - SPEEDS

 

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Miles per hour is a unit of speed, expressing the number of international miles covered per hour. The common abbreviation in everyday use is mph, although mi/h, using the SI method of expressing derived units, is sometimes used, especially in the United States. The preferred SI unit for velocity is m/s (metres per second), although km/h or kph is often used as a replacement for mph.

 

 

 

When calculating how fast - this will help

 

 

1 mph is equal to:

  • 0.44704 m/s, the SI derived unit

  • 1.609344 km/h

  • 22/15 =1.4667 feet per second

  • approx. 0.868976 knots

Miles per hour is the unit used for speed limits on roads in the US and Britain.

 

 

Examples of speeds in mph

 

3 mph

Walking speed

15 mph

Bicycling speed

23 mph

Top speed of a running human. (34 ft/s)

30 mph

Residential speed limit
Top speed of a running cat, or dog

5060 mph

Speed limit on a major road
Top speed of an antelope

70 mph

Highway or motorway speed
Top speed of a cheetah

180 mph

High-speed train

625 mph

Airliner cruising speed

761 mph

The approximate speed of sound (at sea level)

763 mph

Current world land speed record

16,250 mph

Re-entry speed of a space shuttle

25,200 mph

Earth's escape velocity

670,616,629 mph

Speed of light

 

 

Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The correct SI symbol is km/h or kmh−1, although the unit is sometimes written colloquially as kph, kmph, or km/hr. None of these corruptions is correct under the rules of SI in reference to correct style when using symbols. It is often spoken and sometimes written as klicks or kays in slang usage.

By definition, an object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

  • 3.6 km/h ≡ 1 ms−1, the SI derived unit of speed, metre per second

  • 1 km/h ≈ 0.27778 m/s

  • 1 km/h ≈ 0.62137 mph ≈ 0.91134 foot per second


Examples of speeds in km/h

 

5 km/h

Walking speed

20 km/h

Easy bicycling speed

36 km/h

Top speed of a running human. (100 m in 10 seconds)

50 km/h

Residential speed limit
Top speed of a running cat, or dog

8090 km/h

Speed limit on a major road
Top speed of an antelope

100120 km/h

Highway or motorway speed
Top speed of a cheetah

300 km/h

High-speed train

1,000 km/h

Airliner cruising speed

1,200 km/h

The approximate speed of sound (at sea level)

1,228 km/h

Current world land speed record

26,000 km/h

Re-entry speed of the space shuttle

40,320 km/h

Earth's escape velocity

1,079,252,848.8 km/h

Speed of light (exact)

 

 

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