Speed Totally Explained

Everything about Speed totally explained

Speed is the rate of motion, or equivalently the rate of change in position, often expressed as distance d traveled per unit of time t.
Speed is a scalar quantity with dimensions distance/time; the equivalent vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but doesn't contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.
In mathematical notation, it's simply:
ť

v = left|frac

Examples of different speeds

Below are some examples of different speed (see also main article Orders of magnitude (speed)):

Speed of a common snail = 0.001 ms^-1; 0.0036 km/h; 0.0023 mph.

A brisk walk = 1.667 ms^-1; 6 km/h; 3.75 mph.

Olympic sprinters (average speed over 100 metres) = 10 ms^-1; 36 km/h; 22.5 mph.

Speed limit on a French autoroute = 36.111 ms^-1; 130 km/h; 80 mph.

Top cruising speed of a Boeing 747-8 = 290.947 ms^-1; 1047.41 km/h; 650.83 mph; (officially Mach 0.85)

Official air speed record = 980.278 ms^-1; 3,529 km/h; 2,188 mph.

Space shuttle on re-entry = 7,777.778 ms^-1; 28,000 km/h; 17,500 mph.

the speed of sound in air (Mach 1) is about 340 ms^-1, and 1500 ms^-1 in water

Taipei 101 Observatory Elevator = 1010 m/min ; 16.667 ms^-1 ; 60.6 km/h; 37.6 mphFurther Information

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