Distance divided by Time
speed
Velocity is defined as speed in a certain direction, or vector.
The speed of light in vacuum is defined to be exactly 299,792,458 metres per second.
This is because speed is defined as the absolute value of velocity - irrespective of the direction of motion.
Also 1.5. That's how the index of refraction is defined.
Velocity is defined as the speed in a given direction. It is a vector quantity that includes both the magnitude (speed) and direction of motion.
speed
speed and wind
Velocity is defined as speed in a certain direction, or vector.
The distance travelled divided by time. Distance/time = speed
Why? Because that's the way speed and velocity are defined.
"Speed" is.
Instantaneous speed is the speed at a specific instant. It is calculated as the average speed (defined as distance / time), for very small times.
The speed of light in vacuum is defined to be exactly 299,792,458 metres per second.
Speed
That's how "Mach" is defined.
That is velocity.