A 60- kg concrete block rests on a level table a 39- kg

Question

Problem: A 6.0- kg concrete block rests on a level table. A 3.9- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.4 m/s²,

Part A: What is the coefficient of friction between the block and the table?

I want help to find the coefficient of friction between the block and the table.