Solving Friction & Gravity Homework: Acceleration of Blocs

[astrololo]

Homework Statement

Two blocs with the same mass have the same rope which links them. The friction coefficients are the same whatever the surface. The blocs are initialy stationary and we let them move. What is the module of the acceleration of the blocs if static coefficient of friction =0,25
Cinetic coefficient of friction = 0,2

Homework Equations

Newton's second law. Sum forces = ma
and
fs or c = u* n (friction formula)

The Attempt at a Solution

I don't know what to do to be honest. I know what forces we have, I know how to write Newton's formula for each object and I get a total of 4 formulas for NEwton's second law. But after that, where do I go ?

 

[mfb]

Where are the blocks? Why should they move at all? There is something missing.

I don't know what to do to be honest. I know what forces we have, I know how to write Newton's formula for each object and I get a total of 4 formulas for NEwton's second law. But after that, where do I go ?

They are connected by a rope, so their distance cannot increase.

 

[astrololo]

Where are the blocks? Why should they move at all? There is something missing.
They are connected by a rope, so their distance cannot increase.

I'm REALLY sorry, I forgot this : http://imgur.com/Dw7XvAE

 

[mfb]

You should get as many equations as unknowns, so you can solve the problem.

 

[astrololo]

You should get as many equations as unknowns, so you can solve the problem.

Ok, so how many ? 2 in 2 ?

 

[Matejxx1]

Draw a free body diagram for both blocks and match all the forces acting on the y and x axis

 

[mfb]

Ok, so how many ? 2 in 2 ?

That depends on how you set up the equations. Some constraints can be included directly in the choice of variables.
It would help to show your equations.