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The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = Italian physicist Galileo Galilei is usually credited with being the first to measure speed by considering the distance covered and the time it takes.Galileo defined speed as the distance covered per unit of time. A cyclist who covers 30 metres in a time of 2 seconds, for example, has a speed of 15 metres per second.Average speed does not describe the speed variations that may have taken place during shorter time intervals (as it is the entire distance covered divided by the total time of travel), and so average speed is often quite different from a value of instantaneous speed.Using this equation for an average speed of 80 kilometres per hour on a 4-hour trip, the distance covered is found to be 320 kilometres.If a car is said to travel at 60 km/h, its speed has been specified.However, if the car is said to move at 60 km/h to the north, its velocity has now been specified.By looking at a speedometer, one can read the instantaneous speed of a car at any instant.A car travelling at 50 km/h generally goes for less than one hour at a constant speed, but if it did go at that speed for a full hour, it would travel 50 km.

Each speed dating event has its own separate rules relating to time limits and what information can be shared.The big difference can be discerned when considering movement around a circle.When something moves in a circular path and returns to its starting point, its average velocity is zero, but its average speed is found by dividing the circumference of the circle by the time taken to move around the circle.This is because the average velocity is calculated by considering only the displacement between the starting and end points, whereas the average speed considers only the total distance traveled.A point on the outside edge of a merry-go-round or turntable travels a greater distance in one complete rotation than a point nearer the center.

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