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## Homework Statement

The object of the figure below has 2 disks attached on both sides through and axel of negligible mass. Both disks of mass M. I need to find the linear acceleration of this object knowing there exists a tension T on the cord.

## Homework Equations

:[/B]T=αI

## The Attempt at a Solution

:[/B]First we know that :

τ=αI ⇒

T(R-r)=I(a/R)⇒

T(R-r)=(2(MR^2)/2)(a/R)⇒

T(R-r)=MRa⇒

a=(T(R-r))/(MR)

But the solution of the exercise is

**: a=(T(R-r))/(3MR)**

What am I doing wrong?

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