If you know the initial speed (u), acceleration (a) and time (t),
then the final speed, v = u + at.
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Speed = distance divided by time
Speed = Distance divided by Time
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).
Average speed = (distance covered) divided by (time to cover the distance)
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