Ali Asadullah
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How can we prove that (vf+vi)/2 is valid only for constant acceleration?? 
Equation of motion and acceleration
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That is not true. It can be valid for non-constant acceleration, in some cases.Ali Asadullah said:How can we prove that (vf+vi)/2 is valid only for constant acceleration??
Example:
v = At3 + B, -1 s ≤ t ≤ 1 s, where A and B are constants