Dropping an object from the CN Tower.
When we drop an object from a height, it goes through free-fall motion. In such a free-fall motion, the acceleration of the falling object is constant. The major factor that affects the acceleration of a falling object is gravity. The higher the force of gravity, the higher the acceleration of the object.
Another factor is drag or air resistance. Drag slows down the falling object. If the surface area of the object is larger than it will face more drag as compared to an object having smaller surface area.
Therefore, gravity and drag are the two main factors that affect the acceleration of a falling object.