## How to get average velocity from velocity vs. time graph(acceleration not constant)

How does one get the average velocity from a velocity vs. time graph, when acceleration is not constant.

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 If you have a velocity -time graph the area under it is the distance travelled between t1 and t2 The average velocity is $${\rm{average velocity = }}\frac{{{\rm{total distance}}}}{{{\rm{total time}}}}{\rm{ = }}\frac{{{\rm{Area under graph between }}{{\rm{t}}_{\rm{1}}}{\rm{and }}{{\rm{t}}_{\rm{2}}}}}{{{{\rm{t}}_{\rm{2}}}{\rm{ - }}{{\rm{t}}_{\rm{1}}}}}$$
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