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Let's do a calculation or two, shall we? (Note: All those wishing to skip the boring math can just read the lower portion of this answer.) Finding the speed you're going for: $$v=\frac{15 \text { ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:39Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/3876 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/