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How fast is 268 meters per second?

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It's about four-fifths as fast as The Speed of Sound.
In other words, 268 meters per second is 0.7810 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.280 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 meters per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 1,497 m/s to 1,560 m/s in water, depending on its salinity.
It's about seven-tenths as fast as a Bullet (Handgun).
In other words, 268 meters per second is 0.6980 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.430 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 383 meters per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about two-and-a-half times as fast as a Peregrine Falcon.
In other words, 268 meters per second is 2.480 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.4030 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 108 meters per second when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about two-fifths as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 2.50 times 268 meters per second.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 660 meters per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about three times as fast as The CRH (train).
In other words, 268 meters per second is 2.80 times the speed of The CRH (train), and the speed of The CRH (train) is 0.360 times that amount.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 97 meters per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about three times as fast as a Porsche 911.
In other words, 268 meters per second is 2.930 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.3410 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 91.40 meters per second. It takes just 7.4 seconds for the GT2 to accelerate to 44.70 meters per second.
It's about three times as fast as an Arrow (archery).
In other words, 268 meters per second is 2.9890 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.33460 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 89.670 meters per second 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.