Speed is how fast and object is travelling and is always equal to the distance travelled in one second.
To measure the average speed = d=v/t
Average speed is the steady speed of and object over a period of time.
Instantaneous speed is the speed of an object at a particullar time (instant)
To measure the instantaneous speed you use a light gate.
When the moving object breaks the beam of light, the timer starts then as soon as the beam is remade the timer stops and the accurate speed can be calculated.
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