Here's why:
* Gravity: The primary force acting on a falling object is gravity. Gravity constantly pulls the object downwards, causing it to accelerate.
* Acceleration: Acceleration means a change in velocity. Since gravity causes acceleration, the velocity of a falling object increases over time.
However, there are some factors to consider:
* Air Resistance: Air resistance opposes the motion of a falling object. As the object falls faster, air resistance increases. Eventually, the force of air resistance will equal the force of gravity, and the object will stop accelerating. This is called terminal velocity.
* Vacuum: In a vacuum, where there is no air resistance, the velocity of a falling object will continuously increase at a constant rate due to gravity.
In summary: The velocity of falling objects changes due to the force of gravity. The rate of change in velocity is affected by air resistance and other factors.
