* Gravity is constant: The Earth's gravitational pull is consistent near the surface, pulling everything towards the center at approximately 9.8 m/s².
* Initial velocity doesn't affect acceleration: While throwing the object downwards gives it an initial velocity, this only affects its *speed*. The acceleration, which is the rate of change of velocity, is still determined by gravity.
Think of it this way:
* Dropping: The object starts with zero velocity and accelerates downwards at 9.8 m/s².
* Throwing: The object starts with a non-zero velocity and *also* accelerates downwards at 9.8 m/s². This means its speed increases faster than if it were just dropped.
In summary: The acceleration due to gravity is constant. Throwing an object downwards only gives it an initial velocity, not a greater acceleration.
