Miles per hour to kilometers per hour converter

In physics, the ratio of the distance traveled speed and duration of movement of the body. Name archaic, velocity, speed, fast. The average speed of the material point is the ratio of the vector displacement Dd and the time interval Dt has been carried out movement. The maximum possible speed at which energy or information can travel in accordance with the theory of relativity, the speed of light in vacuum c = 299792458 m / s. c is an absolute constant - the universal constant in the equation established by Einstein.