Average acceleration for non-uniform circular motion

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maths12345
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So I know average acceleration is v2/r and is equal to instantaneous acceleration in uniform circular motion.

But what is average acceleration in non-uniform circular motion (e.g. its speed is increasing) or in non circular motion (e.g. elliptical motion)?
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Desk-Lamp
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the question is difficult to answer without more specific details about exactly what you want to calculate. The formula you give calculates radial acceleration towards the centre of a circle, but an ellipse doesn't have a single centre, being constructed from two focii.

Also worth noting that in the average acceleration around a circle is NOT equal to the instantaneous acceleration (although there is no single answer for the average acceleration, it depends what time period you average over. If you take it to be 1 period, obviously the answer will be zero)
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