eli5: What is Speed made of? is it a sort of time particle?

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eli5: What is Speed made of? is it a sort of time particle?

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Speed depends on the observer, this is relativity. Definitely not time particles, but rather light showing when the moving thing passed point A and point B and the distance between A and B.

Speed can be measured directly, for some macro objects, using the Doppler shift of waves sent towards the moving object.

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