^^^ Speaking of the speed of projectiles, the Navy has just (yes, just!) received its first prototype railgun.
Quote:
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While the muzzle velocity of gunpowder-propelled projectiles is generally limited to around 4,000 ft per second (2,727 mph/4,389 km/h), the U.S. Navy says its railgun will be capable of launching projectiles at velocities of 4,500 to 5,600 mph (7,242 - 9,012 km/h).
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