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Final Velocity minus Initial Velocity (all together this is the change in velocity) divided by the average acceleration will give you the time it took for the object to reach that speed.
(Vf - Vi) / Aaverage = Time
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What is the equation for accelaration?
Acceleration equals: final speed, minus original speed, divided by total time. Source: (http://www.scienceteacherprogram.org/physics/Torpie00-1.html)
How do you find average acceleration?
Acceleration = (change in speed) divided by (time for the change)
If a runner increases her velocity from 2 meters per second to 4 meters per second over a period of 20 seconds what is the acceleration?
Magnituide of acceleration = (change in speed) divided by (time for the change)= (final speed - initial speed) divided by (time for the change)= 2/20 = 0.1 meter per second2Note that this is the magnitude of the acceleration, obtained by working with the speeds.We don't know the initial or final velocities, because there's no information regarding directions.Similarly, we only know the magnitude of the acceleration, not its direction.
What is change in speed divided by time?
That is called acceleration.
What equals speed divided by time?
That's an acceleration.
