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When determining the motion of the planets in the solar system, what is a good reference point to use? explain

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When determining the motion of the planets in the solar system, what is a good reference point to us...

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Physics, 26.11.2020 15:50

Suppose someone travels 50 mi at 50 mi/h, then travels 50 mi at 25 mi/h, then travels 50 mi at 10 mi/h.