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Published on May 7, 2015
Two colleagues provided their iPhone6 for this 240fps slowmo video, one for video, the other for clock with (nearly) 100th of second resolution. Singlestepping 200 frames advances clock by 0.84s, so 4.2ms per frame or 1000/4.2=238.1fps. Speed: 370*(0.048*π)*3600/1000 = 200.8km/h !