Two stacked blocks attached to a spring

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

2. Relevant equations
F_spring = kx, where x is the distance compressed
f_friction = uN

3. The attempt at a solution
Forces acting on m: N_1 up, mg down, f_friction to right
Forces acting on M: N_2 up, Mg+N_1 down, f_spring to the right

Block m will still be in equilibrium as long as the force exerted by the spring equals the force of friction:

kx = uN_1
The block isn’t accelerating in y-direction so N_1 = mg
So kx = u*mg
x = u*mg/k

Does that look fine?

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