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Speed is a scalar, being the magnitude of the velocity vector which in relativity is the four-velocity and in three-dimension Euclidean space a three-velocity. Speed is empirically measured as average speed, although current devices in common use can estimate speed over very small intervals and closely approximate instantaneous speed.
Continuing to work in the (non-relativistic) Newtonian limit we begin with a Galilean transformation in one dimension: [note 2] ′ = ′ = where x' is the position as seen by a reference frame that is moving at speed, v, in the "unprimed" (x) reference frame.
Please help update this article to reflect recent events or newly available information. ( January 2025 ) This is a sortable list of broadband internet connection speed by country, ranked by Speedtest.net data for March 2024, [ 1 ] and with M-Lab data for June 2023 [ 2 ]
In this context, "speed of light" really refers to the speed supremum of information transmission or of the movement of ordinary (nonnegative mass) matter, locally, as in a classical vacuum. Thus, a more accurate description would refer to c 0 {\displaystyle c_{0}} rather than the speed of light per se.
Although the term broadband once had a technical meaning, it is used in marketing and policy to generally apply to relatively high data rate (and thus more expensive) Internet access, while technology changes over time. One 2007 estimate used five speed ranges, with the lowest being from 200 kbit/s to 768 kbit/s, and the highest was more than 6 ...
Cable Internet access at speeds up to 2 Gbit/s [86] and Gigabit Pro Fiber in select areas with speeds up to 10 Gbit/s. [87] AT&T: 15,452,000 [85] DSL access at speeds up to 18 Mbit/s, and FTTN VDSL2 access (AT&T Internet) at speeds up to 100 Mbit/s. Fiber access available at up to 5 Gbit/s [88] Charter Spectrum: 30,328,000 [85]
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