Great speed is faster than normal.
Swiftly means to do something quickly and with great speed or promptness.
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It is called a definition.
The definition of the speed of light in a vacuum is 300,000,000 meters/sec, or 186,000 miles/sec.
Initial speed is the original, beginning speed of an object.
Quickness, speed
they are fast
"instantaneous speed"
The speed that an object moves through the air.
By definition acceleration is the change in velocity (speed).
The definition of haste is: swiftness of motion; speed; celerity or unnecessarily quick action; thoughtless, rash, or undue speed
There are different types of speed formulas: Speed= Wavelength(frequency) or Speed= Distance/Time