The value of 299,792,458 meters per second (186,282 miles per second) is the speed of light in a vacuum. However, light actually slows down as it passes through different media. For instance, when it moves through glass, it slows down to about two-thirds of its speed in a vacuum. Even in air, which is nearly a vacuum, light slows down slightly. Highway speed limits can range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h). Some states have lower limits for trucks, some also have night and/or minimum speed limits . The highest speed limits are generally 70 mph (113 km/h) on the In Scientific Notation. 400 feet per second. = 4 x 10 2 feet per second. ≈ 2.72727 x 10 2 miles per hour. 2500 Miles per hour = 3.7279×10-6 Speed of light: 2 Miles per hour = 2.982×10-9 Speed of light: 20 Miles per hour = 2.9823×10-8 Speed of light: 5000 Miles per hour = 7.4558×10-6 Speed of light: 3 Miles per hour = 4.473×10-9 Speed of light: 30 Miles per hour = 4.4735×10-8 Speed of light: 10000 Miles per hour = 1.5×10-5 Speed of light We hear about players hitting top speeds of 20 and 21 MPH all the time, so if Chris Johnson ’s 4.24, the fastest in combine history, was shy of that, how fast are these guys really? The answer 9uki0C.

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