meter and second
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Linear speed is typically expressed in units like meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). These units convey the distance covered by an object in a certain amount of time, providing a measure of how fast an object is moving in a straight line.
You can express or determine the speed of wind using the Beaufort Wind Scale.
In the case of a solid rotating object, the rotational speed is the same for all parts. The linear speed is greatest at points that are furthest from the axis of rotation - in other words, at the equator.
The Earth's greatest linear speed occurs at the equator, where its rotation causes a point on the surface to move around the planet at about 1,670 kilometers per hour (1,040 miles per hour).
Speed of light
i think it is 10 to 20 mphs