Publisher's Synopsis
Excerpt from Notes on Mechanics
For uniform motion it is evident that speed equals the-space traversed in any given time divided by that time.
In physical treatises, however, it is usual to distinguish between velocity and speed, making the former a vector quantity, involving both magni tude and direction, while the latter denotes magnitude only, as defined above.
It is furthermore evident that the speed of a' particle at any instant is always the space which it would describe in a unit of time. Were its speed to remain of the same value during that time.
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