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How fast is 100 kilometers per hour?

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It's about twenty times as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 0.048 times 100 kilometers per hour.
(Manhattan; average speed; 8,978 person-sample)
A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 4.70 kilometers per hour. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 5.10 kilometers per hour
It's about one-twenty-fifth as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 24 times 100 kilometers per hour.
(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 2,400 kilometers per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-thirty-fifth as fast as a Bullet (Rifle).
In other words, the speed of a Bullet (Rifle) is 32.90 times 100 kilometers per hour.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 3,294 kph. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about 60 times as fast as an Iceberg.
In other words, the speed of an Iceberg is 0.02 times 100 kilometers per hour.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 2 kilometers per hour. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about one-three-hundredth as fast as The Space Shuttle.
In other words, 100 kilometers per hour is 0.0035872 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 278.770 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877 kph. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about 400 times as fast as a Sloth.
In other words, 100 kilometers per hour is 410 times the speed of a Sloth, and the speed of a Sloth is 0.0024 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.24 kph. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-one-thousand-five-hundredth as fast as a Meteor.
In other words, the speed of a Meteor is 1,500 times 100 kilometers per hour.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 40,000 kph and 260,000 kph, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 10,000 kph.