2 ms·
For speed we don't measure it "upside down", no. But there is another transformation: "rapidity", which does add linearly (at least for one spatial dimension)
by wnoise 8y ago
For speed we don't measure it "upside down", no. But there is another transformation: "rapidity", which does add linearly (at least for one spatial dimension) and goes to infinity when velocity goes to c.
https://en.wikipedia.org/wiki/Rapidity https://en.wikipedia.org/wiki/Rapidity
- evincarofautumn 8y agoWell no, I just meant that sometimes working in inverse units makes things easier to understand than the “intuitive” units you use in daily life. “Time per distance” helped me personally get a better intuitive sense of time dilation and length contraction. I hadn’t heard of rapidity before, but it’s really interesting, and makes sense after some musing—thanks!