Two blocks (m = 0.468 kg and M = 2.41 kg) and a spring (k = 24.1 N/m) are arranged on a horizontal, frictionless surface. Block m is situated on top of block M. (Spring attached to block M) The coefficient of static friction between the two blocks is 0.873. What is the maximum possible amplitude of simple harmonic motion of the spring/blocks system if no slippage is to occur between the blocks? Im not too sure what to do with this problem, I think i have to match up the normal force on the top block with the force of the spring on the bottom. but im not sure.