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Speed is how fast something is going when the direction in which it is travelling is unimportant.

Velocity is a measurement of the rate at which an object is changing its position. As such, in order to measure it, one must define both the speed at which an object is moving, and also the direction of movement.

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Q: What is the definition of speed and the definition of velocity?
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Related questions

What is the scientific definition of velocity?

Speed and acceleration.


How is increasing speed acceleration?

By definition acceleration is the change in velocity (speed).


What is velocity definition?

Velocity is the speed of an object.


What is the definition velocity?

Speed plus the direction of travel.


Why speed is scalar while velocity is vector?

Speed is scalar (that is, without direction) and velocity is a vector (speed plus direction) by definition in physics.


Can an object acceleration if its velocity is constant?

No. It is a matter of definition. Acceleration is defined as a change of velocity. Technically, one must distinguish between velocity and speed. Velocity is a vector and includes the information about the magnitude (speed)and direction. One can have a constant speed and an acceleration (as in circular motion) but, by definition, constant velocity means zero acceleration.


What is group velocity?

The official definition for the word group velocity is "the speed at which the energy of a wave travels."


What is the definition of high speed?

Meaning something that goes at extreme velocity.


What is the speed and direction at which something moves?

That's the definition of its velocity vector.


What is the definition of speed of an object and specification of its direction of motion?

If the speed of an object is cited and its direction of motion is also cited, we have the velocity of the object. Velocity is speed plus a direction vector.


Why the speed of an object is constant while the velocity is not?

This is not always the case. But if an object moves in a circle, at constant speed, its velocity will change. Velocity is a vector - consisting of the magnitude (the speed), and a direction. So by definition, if the direction changes, the velocity changes - you have a different vector.


Can wind have speed?

Wind is simply the movement of air. By definition, this movement has velocity (it has speed plus a direction).