Can anyone help me out with this tension problem please?

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SUMMARY

The discussion focuses on calculating the tension in a massless string connecting two blocks sliding down an incline. The key equation used is F=ma, with the contributor isolating forces acting on the blocks. The contributor notes that the friction of the higher block increases tension while the friction of the lower block decreases it, but they ultimately disregard these frictions for simplification. The contributor suggests summing forces in both the X and Y directions to solve for tension (Ft).

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The two blocks in the figure are sliding down the incline. What is the tension in the massless string?
[PLAIN]http://img842.imageshack.us/img842/2586/physicshelp.jpg

Homework Equations



F=ma
That's honestly all I got.

The Attempt at a Solution



Well I realized that the higher block's friction adds to the tension, and the lower block's friction reduces tension. That being said they are equal so I disregarded them and simply tried

2gsin20-gsin20=Ft
 
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Sum the forces in X and Y direction and solve for Ft. Its easier if you project the X axis onto the inclined plane.

Lets just Isolate one of the blocks:
[PLAIN]http://img137.imageshack.us/img137/7338/blockeah.png

Can you sum the forces on this block?
what about the other block?
 
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