# Speed Measure

A Speed Measure is a physical object measure based on the physical distance traveled divided by the time it takes.

**AKA:**Velocity's Magnitude**Context**- It can (typically) represent the Vector Norm of a Velocity Measure.

**Example(s):****Counter-Example(s):****See:**Rapidity, Distance, Kinematics, Magnitude (Mathematics), Velocity, Time Derivative, Position (Vector), Scalar (Physics), Time, Limit (Mathematics), Dimensional Analysis, Length.

## References

### 2016

- (Wikipedia, 2016) ⇒ https://en.wikipedia.org/wiki/speed Retrieved:2016-4-29.
- In everyday use and in kinematics, the
**speed**of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.^{[1]}The**average speed**of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.Speed has the dimensions of a length divided by a time; the SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.

The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum

*c*= metres per second (approximately or). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

- In everyday use and in kinematics, the

- ↑ This is the likely origin of the speed/velocity terminology in vector physics.