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asdf1
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In this section explaining relativity,
" If a mirror clock and a conventional clock in the spacecraft agree with each other on the ground but not when in flight, the disagreement between them could be used to find the speed of the spacecraft independently of anyh outside frame of reference - which contradicts the principle that all motion is relative."
i don't understand what is meant by why the principle is contradicting...
can somebody explain why?
" If a mirror clock and a conventional clock in the spacecraft agree with each other on the ground but not when in flight, the disagreement between them could be used to find the speed of the spacecraft independently of anyh outside frame of reference - which contradicts the principle that all motion is relative."
i don't understand what is meant by why the principle is contradicting...
can somebody explain why?