What formula is a = μ mg / M

This is the formula for calculating acceleration!
This formula is applicable to the case that when an object slides on an unsmooth horizontal surface, there is no other force except friction, so the acceleration is equal to the friction divided by the mass of the object
The derivation process is as follows
f=μN=μG=μmg
a=f/m=μmg/m=μg

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