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The time rate of change of the position of an object

0 votes
2 answers
104 views

Midframe Lemma and composition of velocities [closed]

How is this compatible with the velocity addition formula? …
Генивалдо's user avatar
6 votes
2 answers
1k views

Physical Motivation for Four-Velocity definition

I'm bothered with the motivation behind defining a four-velocity. …
Генивалдо's user avatar