Here's why:
* Gravity: The primary force acting on objects in free fall is gravity. Near the Earth's surface, gravity provides a relatively constant downward force.
* Acceleration: Force causes acceleration (Newton's second law: F = ma). Since the force of gravity is constant, the acceleration it causes is also constant.
* Value: This constant acceleration due to gravity is approximately 9.8 m/s² (meters per second squared). This means that for every second an object falls, its downward velocity increases by 9.8 meters per second.
Important Note: This constant acceleration only applies in a vacuum. In reality, air resistance can significantly affect the motion of falling objects, especially at higher speeds.
