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How fast is 658 meters per second?

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It's about 10,000 times as fast as a Sloth.
In other words, 658 meters per second is 9,800 times the speed of a Sloth, and the speed of a Sloth is 0.0001 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.067 meters 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 one-four-hundred-fifty-thousandth as fast as The Speed of Light.
In other words, 658 meters per second is 0.000002194851750 times the speed of The Speed of Light, and the speed of The Speed of Light is 455,611.6380 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 299,792,458 meters per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 199,861,638.67 m/s when passing through the glass of a typical window.
It's about 15,000,000,000 times as fast as Grass growing.
In other words, the speed of Grass growing is 0.0000000000630 times 658 meters 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 0.0000000420 meters 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.