What is measured speed?
Let's follow along with you how the concept of speed arises and with what units its measurement is possible. Such a physical quantity, as speed, is based on the amount of time spent to overcome the distance traveled. Therefore, in the speed indicators there will always be units of measure for distance and time. Subsequently, everything depends on the chosen system for measuring the path: either meters, or kilometers, or miles, etc .; and the selected time measurement system: seconds, minutes, hours, days, etc.
Thus, in the end, we obtain the following indicators of speed as: miles / hour, meters / second, kilometers / hour, etc. In the general international system of SI, the indications of speed, expressed in the meters passed per second, are indicated and are indicated as m / s.
What is measured speed can be found with the help of a device called a speedometer, so often installed on vehicles, such as cars.Moreover, for European countries and the CIS countries, the expression of speed in km / h is characteristic, and for the American part of the population and some other countries of the world, the expression is expressed in miles / hour. For reference, 60 miles / hour is approximately our 100 km / hour, to be more precise, it is slightly less and amounts to 96 km / hour.
For water vehicles, there is another system for calculating speed, and can be expressed in: nodes, miles per hour (nautical mile), cable per minute. It should also be borne in mind that there is a difference between sea and river vessels in terms of speed indicators.