Here's why:
* Gravity's Constant Pull: The primary force acting on a freely falling object is gravity. Gravity exerts a constant downward force, causing the object to accelerate.
* Acceleration: Acceleration means a change in velocity over time. In this case, the velocity is increasing because the object is speeding up.
* Linear Increase: The speed reading on the speedometer would increase in a linear fashion. This means the speed would increase by the same amount every second (assuming no air resistance).
Important Note: This assumes there is no air resistance. In reality, air resistance will slow the object down, causing the speed to increase at a slower rate and eventually reach a terminal velocity where the force of gravity is balanced by air resistance.