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854 kilometers per hour is about two-and-a-half times as fast as an Arrow (archery)
In other words, it's 2.646 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.3779 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 322.8 kph when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
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