Answer :

[tex]v_{f} = final velocity[/tex]

[tex]v_{o} = initial velocity[/tex]

[tex]t_{f} = final time[/tex]

[tex]t_{o} = initial time[/tex]

[tex]a = average acceleration[/tex]

[tex]a = \frac{(v_{f}-v_{o})}{(t_{f}-t_{o})} [/tex]
AL2006
Average acceleration =
             (change in speed over some time) / (time for the change)
(could be positive or negative)

Change in speed = (speed at the end) - (speed at the beginning)
(could be positive or negative)

Time for the change = (time at the end) - (time at the beginning)
(always positive)

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