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How fast is 4.6 feet per second?

It's about 35,000,000 times as fast as Grass growing
The speed of Grass growing is about 0.000000130 feet per second.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.000000140 feet per second in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.
It's about twenty times as fast as a Sloth
The speed of a Sloth is about 0.220 feet per second.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.220 feet per second. 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 three times as fast as an Iceberg
The speed of an Iceberg is about 2 feet per second.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 2 feet per second. 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-and-one-tenth times as fast as Walking Pedestrians (in Manhattan)
The speed of Walking Pedestrians (in Manhattan) is about 4.30 feet per second.
(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 4.30 feet per second. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 4.60 feet per second
It's about seven-tenths as fast as Michael Phelps
The speed of Michael Phelps is about 6.3730 feet per second.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 6.3730 feet per second. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about half as fast as a Crocodile
The speed of a Crocodile is about 8.90 feet per second.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 9.10 feet per second. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 18 feet per second.
It's about one-fifth as fast as a Bull
The speed of a Bull is about 22 feet per second.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
The herd of the annual Encierro in Pamplona, Spain runs at an average speed of 22 feet per second. The Encierro is run annually from July 7th through July 14th and involves 42 bulls, 77 oxen, and an estimated 17,000 runners over the course of the event.
It's about one-fifth as fast as Noah Ngeny
The speed of Noah Ngeny is about 24.860 feet per second.
(in Rieti, Italy; 1999) (sprinter; 1978-)
Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 24.860 feet per second. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about one-tenth as fast as Flo-Jo
The speed of Flo-Jo is about 30.750 feet per second.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 30.750 feet per second. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about one-tenth as fast as Usain Bolt
The speed of Usain Bolt is about 33.80 feet per second.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 33.90 feet per second at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
It's about one-tenth as fast as Michael Johnson
The speed of Michael Johnson is about 33.960 feet per second.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 33.970 feet per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about one-tenth as fast as Secretariat
The speed of Secretariat is about 55.10 feet per second.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 55 feet per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about one-fifteenth as fast as a Gazelle
The speed of a Gazelle is about 70 feet per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 70 feet per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about one-fifteenth as fast as a Hare
The speed of a Hare is about 70 feet per second.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 70 feet per second. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-fifteenth as fast as a Greyhound
The speed of a Greyhound is about 65.90 feet per second.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 66 feet per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
 
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