Gist: The unsigned value of instantaneous velocity — magnitude kept, direction discarded.
Why it matters: It is what a speedometer reads. Unlike average speed, which needs an interval, it is defined at a single instant.
Source wording
p.3 reads “instantaneous speed is non signed value of average velocity”. It should be instantaneous velocity. Confirmed as a slip in the source, not a transcription error.
Detail: Lecture 2, p.3
Related: Instantaneous velocity, Average speed, Physics