Two blocks, of masses M and m, are connected by a light string passing over a very small frictionless pulley

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Two blocks, of masses M and m, are connected by a light string passing over a very small frictionless pulley. Initially, both of the blocks are at rest because of friction between block M and the horizontal surface. Then block m is pulled sideways until the string makes angle with the vertical and then released. At this point, the length of string between the pulley and the block is L. Block M begins to slide at the very moment block m passes through its original position.

(Part a)  Draw free body diagram for each block.

(Part b) According to free body diagram in part (a) write down the equations and find the coefficient of static friction us between block M and the horizontal surface.