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## Homework Statement

The dropped disk rolls down with acceleration of centre of mass. The disks are identical, find accleartion of cm in terms of angular acceleration

## Homework Equations

[/B]

a = r*alpha

## The Attempt at a Solution

I don't know where to begin, I think the alphas should be equal. but I'm not sure, let's assume that. so the string accelerates at r*alpha, this should be the same as r*alpha + Acm of the other disk... r*alpha = r*alpha + acm...= 0

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ps: answer is 2 r*alpha