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So here are my questions so far:

-I am assuming that every object has an absolute velocity; am I right?

-We measure kinetic energy with respect to a rigid body such as that of the earth. Do I possess kinetic energy at this moment in which the earth is moving? That is I am moving at a certain velocity even if I am at rest with respect to the earth. How can the measurement of kinetic energy be accurate then?

-I am not quite sure what Einstein was intending to explain near the beginning of the book with Gallaien coordinates.