[問題] 一題相對論
附上題目原文：
Consider two inertial reference frames.When an
observer in each frame measures the following
quantities, which measurements made by the two
observers must yield the same results?
(d) The time interval between two events.
(e) Newton's first law.
課本給的解答是：
(d) No. The result depends on the relative motion of the frames.
(e) No. The result depends on the speeds involved.
實在看不太懂，請問有沒有人可以幫我詳細的說明一下?
(尤其是(e) Newton's first law在inertial reference frame不是成立的嗎?)
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