The gravitational acceleration of any object near Earth is the same, regardless of its mass, due to a fundamental principle of physics: Newton's Law of Universal Gravitation.

Here's a breakdown:

* Newton's Law of Universal Gravitation: This law states that every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

* Force and Acceleration: The force of gravity acting on an object is what causes its acceleration. The relationship between force (F), mass (m), and acceleration (a) is described by Newton's Second Law of Motion: F = ma.

* Canceling Out Mass: When considering the gravitational force between the Earth and an object, the force (F) is directly proportional to the object's mass (m). However, the acceleration (a) is inversely proportional to the object's mass. This means that the mass cancels out in the equation for acceleration, leaving us with a constant value.

In simpler terms:

Imagine two objects, one with a small mass and one with a large mass, falling towards Earth. While the larger object experiences a stronger gravitational force due to its larger mass, it also has more inertia (resistance to change in motion). This means it takes more force to accelerate the larger object. The increased force and increased inertia perfectly balance each other out, resulting in the same acceleration for both objects.

Important Note: This is true only for objects near the Earth's surface. As you move further away from the Earth, the gravitational force weakens, and the acceleration due to gravity decreases.