Velocity is relative in the following sense:

Subjective value of an objective velocity changes under Galilean transformation. Different inertial observers would see different velocity values.

Acceleration is absolute in the following sense:

Subjective value of an objective accelerative remains unchanged under Galilean transformation. Different inertial observers would see identical acceleration values.

The proof:

In other words, the statement “acceleration is absolute” is with respect to Galilean transformation. It is not with respect to every kind of transformation. Confusing these two meanings is a major bug of @dialectphilosophy.

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Note that Galilean transformation, like many other “transformations”, is conceptual, linguistic, mathematical, logical, coordinate, subjective, but not objective, nor physical, because the two observers are seeing the same underlying physical event.

— Me@2024-01-23 12:12:23 PM

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2024.01.24 Wednesday (c) All rights reserved by ACHK