Here's why:
* Gravity: The only force acting on the ball (ignoring air resistance) is gravity. Gravity pulls the ball downwards with a constant acceleration of approximately 9.8 m/s².
* Direction: While the direction of the ball's velocity changes (upward on the way up, downward on the way down), the acceleration due to gravity always acts downward.
In summary:
* Upward motion: The ball experiences a downward acceleration (due to gravity) that slows it down as it rises.
* Downward motion: The ball experiences the same downward acceleration (due to gravity) that speeds it up as it falls.
Important Note: Air resistance can affect the actual motion of the ball, but in a simplified scenario without air resistance, the acceleration is constant and downward throughout the entire flight.
