How fast something is going can be described in two ways.
The most common is speed. This is simply the distance a body moves in a set time, if a body moves ten metres in two seconds its speed is five metres per second.
The other way is mostly used in things like physics. It is called velocity, and simply means the speed of a body in a certain direction, ie. five metres per second northwards.
"Fast" is an adjective. It describes the speed at which something moves or happens.
It can be either, because there is no adverb form (fastly) for speed.A fast car (adjective)He drove fast (adverb)
Velocity, or Speed
Velocity is the quantity that describes both the speed and direction of an object's motion. It is a vector quantity, meaning it has both magnitude (speed) and direction. Velocity is different from speed, which only describes how fast an object is moving.
An object's speed in a given direction is its velocity. Velocity is a vector quantity that includes both speed and direction. It describes how fast and in which direction an object is moving.
"Fast" is an adjective. It describes the speed at which something moves or happens.
"Fast-paced" is an adjective. It describes something that is moving or happening quickly.
It can be either, because there is no adverb form (fastly) for speed.A fast car (adjective)He drove fast (adverb)
If you use the word "express" as a verb, you could say something like, "I want to express my feelings." "Express" can also be used as an adjective that describes something as fast or convenient, "I am going to the express McDonald's."
Speed is how fast something is going. Velocity is the speed and direction something is going.
acceleration work by speed when something is going fast and when it and go over or faster with something.
.by looking at the time it takes in terms of seconds
To figure out how productive someone is working or how fast something is going.
Velocity, or Speed
Velocity is the quantity that describes both the speed and direction of an object's motion. It is a vector quantity, meaning it has both magnitude (speed) and direction. Velocity is different from speed, which only describes how fast an object is moving.
http://wiki.answers.com/Q/What_is_the_word_used_to_describes_someone_who_is_involved_in_something_and_not_aware_of_what_is_going_on_around_them"
No one knows why the time is going by so fast. However, researches and psychologists have shown that once you are busy focusing or doing something, it seems that time is flying.