Which of the following is not necessarily the same for every observer? Group of answer choices The speed of light in vac

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answerhappygod
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Which of the following is not necessarily the same for every observer? Group of answer choices The speed of light in vac

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Which of the following is not necessarily the same for every
observer?
Group of answer choices
The speed of light in vacuum
The rest mass of a spacecraft
The speed of a radio wave in vacuum
The length of a spacecraft
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