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  • one year ago

Why is it important to define a frame of reference? A. An observer cannot be moving. B. Motion must be defined relative to something. C. It's impossible to measure motion. D. A stationary observer is always moving.

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  1. Michele_Laino
    • one year ago
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    hint: there isn't the absolute motion, namely all motions are relative motions, so, in order to describe a motion mathematically, or in order to make some measurements about a certain motion, we need of a reference system

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