 |
(1)
|
where 
is the radius
vector and 
is the derivative with respect to time. Expressed in terms of the arc
length,
 |
(2)
|
where 
is the unit tangent
vector, so the speed (which is the magnitude of the
velocity) is
 |
(3)
|
Velocity
See also
Angular Velocity, Radius Vector, SpeedExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Velocity." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Velocity.html