Thearos
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You could time the crack and the thud (I make it .3 sec, but obviously I must be a bit slow), to get a speed of 60ms/s or so, 216 kph. Which should be upped a bit to reflect the lag introduced by me while trying to chronometre this, so say 70m/s, 250 kph might be possible as the real speeds.
Interesting in terms of ancient skirmish line tactics. At this range (20m, point-blank), the whole range of missile weapons comes into play-- bow and arrow, big javelin, small javelin, hand-thrown stone, and even running human. Sling must be fastest of all, marginally faster than the arrow. I suppose I'm just saying that skirmishing did not need to take place at extreme ranges (say 200+m), or that long-range weapons could also hold their own even when javelineers, stone throwers or shielded light infantry got into danger-close range.
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