A dragster going at 5 m/s north increases its velocity to 23 m/s north in 4 seconds. What is its acceleration during this time interval?

Acceleration = (change in speed) / (time for the change)Acceleration = (23 - 5) m/s / 4s  =  18/4 m/s²  =  4.5 m/s²

To my recollection vf=vi+at23m/s=5m/s + a (4s)get the like units together23m/s - 5m/s = a (4s)18m/s = a (4s)divide each side by 4 to find a18m/s / 4s = 4.5m/sI don't know how to do the up arrow to square any of the m/s.