When the direction of motion is relevant, you would use velocity rather than speed.
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Because that's the definition of 'velocity'.'Velocity' is not just a word you use instead of 'speed' when you want to sound smart.It's meaning is different from the meaning of 'speed'.'Velocity' has two parts to it . . . speed and direction. If either of those changes, thenthe velocity has changed.
Velocity is speed, plus an indication of direction. To indicate a velocity, you can indicate a speed (this will logically use units of speed), and a direction.
You can sometime use integers but often speed or velocity can also be irrational.
Speed and velocity are the same in magnitude; but speed is a scalar and velocity a vector; a vector has magnitude and direction. For example if an object is moving with a speed of 100 mph in a certain direction its velocity is 100 mph in that direction. If it changes direction ate same speed and you want to compute distance traveled, etc., you would need to use vector addition. We sometimes use speed and velocity interchangeably which is fine for talking purposes.
S is usually used for position and v for velocity or speed.
... a vector quantity. Speed is a scalar, meaning only the magnitude (a number) is used. If the direction of a movement is of interest, you use the word "velocity", instead, to describe the vector. A vector has both a magnitude and a direction.
Speed and Velocity are two different things . Velocity- "the rate at which an object changes its position." Speed- "How fast an object is moving". To calculate speed and velocity, you first need to calculate distance and time. Velocity is considered to be a more logical term
Acceleration is the change in an ogjects speed or a change in an objects direction of motion or both of these. If instead of speed you use the word velocity , which is both an object's speed and its direction of motion, then you could say "acceleration is the change in an objects velocity" and that would cover all the possibilities in one statement.
To calculate angular velocity from linear velocity, you can use the formula: Angular velocity Linear velocity / Radius. This formula relates the speed of an object moving in a circular path (angular velocity) to its linear speed and the radius of the circle it is moving in.
There are many instruments for measuring speed but I am not aware of any for measuring velocity.
To find the linear velocity from angular velocity, you can use the formula: linear velocity angular velocity x radius. This formula relates the speed of an object moving in a circle (angular velocity) to its speed in a straight line (linear velocity) based on the radius of the circle.