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Speed
The speed v describes how fast an object is moving with respect to a frame of reference, but does not tell in which direction.
Explanation
The instantaneous speed of an object is the derivative of the position with respect to time
where
x Displacement t Time
Example 1
If you drive 30 km on a bicycle in 2 hours, you can calculate the speed as 30 / 2 = 15 km/h.