Kleppner and Kolenkow - Pulleys (1 Viewer)

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1. The problem statement, all variables and given/known data

Masses M1 and M2 are connected to a system of strings and pulleys as shown. The strings are massless and inextensible, and the pulleys are massless and frictionless. Find the acceleration of M1.

http://img844.imageshack.us/img844/3758/cimg0572.jpg [Broken]

2. Relevant equations


3. The attempt at a solution

I've reasoned that since the pulley is massless, the net force acting on it must be zero (otherwise the acceleration would be infinitely large). I could then use the tensions in the strings to arrive at an answer for the acceleration of M1, but I'm not sure that my reasoning really applies here. Could someone please offer some guidance?
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This was falling towards the bottom of the page, so I just wanted to bump it before it actually fell off.
Hi, did you ever get a solution or an approach to this problem? I am also working on the same one right now and am stuck on it...

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