You're right to notice that a brick has a much greater mass than a sponge. Here's why the acceleration due to gravity is the same for both:

Acceleration due to gravity is a constant for all objects near the Earth's surface. This constant is approximately 9.8 m/s².

Here's the explanation:

* Gravity and Mass: The force of gravity depends on the mass of the objects involved. A more massive object exerts a stronger gravitational pull.

* Force and Acceleration: Newton's Second Law of Motion states that the force acting on an object is equal to its mass times its acceleration (F = ma).

* Balancing the Equation: While a brick has a larger mass and experiences a stronger gravitational force, it also has a larger inertia (resistance to change in motion). The increased force due to its mass is perfectly balanced by its increased inertia, resulting in the same acceleration.

Imagine this:

If you drop a brick and a sponge from the same height, they will fall at the same rate. They will both hit the ground at the same time (ignoring air resistance).

Key Points:

* Acceleration due to gravity is independent of mass.

* The force of gravity is proportional to mass.

* Inertia is also proportional to mass.

Let me know if you have any other questions!