What are the variables in the formula for average acceleration?

MienTommy
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The formula for average acceleration is (v_final - v_initial) / (t_initial - t_final), I was wondering if v_initial and _final are the instantaneous velocities (found by second derivative of a function) at those points or are they the average velocities (found by change in distance over time)? It has been a while since I've done physics.
 
on Phys.org
Instantaneous velocities.
 
They are instantaneous velocities, yes.
 

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