In a vacuum, both a heavy ball and a light ball will fall at the same rate. This is because gravity exerts the same force on all objects, regardless of their mass.

Here's why:

* Gravity's Pull: The force of gravity depends on the mass of the Earth and the mass of the object. Since the Earth's mass is significantly larger, the object's mass has a relatively small impact on the gravitational force.

* Acceleration Due to Gravity: The acceleration due to gravity (9.8 m/s²) is constant for all objects near the Earth's surface. This means that all objects will fall at the same rate, regardless of their mass.

Why it seems different in the real world:

* Air Resistance: In reality, air resistance plays a significant role. A lighter object will experience more air resistance relative to its weight than a heavier object. This means the lighter object will slow down more, making it appear to fall slower.

The Famous Experiment:

The idea that objects fall at the same rate in a vacuum was famously demonstrated by Galileo Galilei. He is said to have dropped two objects of different masses from the Leaning Tower of Pisa to show that they would hit the ground at the same time.