Explain why the gravitational acceleration of any object near earth is the same as no matter what the mass of the object is?

We know that force of gravitation is

F=GMm/R2

where G is gravitational constant,M is mass of earth,m is mass of object & r is the distance between center of earth n object &

F=mg

where g is acceleration due to gravity.

so,

mg=GMm/R2

g=GM/R2

from above relation it is clear that gravitational acceleration does not depend upon mass of object.So it is same for all objects near earth.