Here's why:
* Gravity is a constant force: It's always present and always pulls objects towards the center of the Earth.
* Direction matters: Even though the object is moving upwards, gravity acts in the opposite direction.
* Slowing down: This downward pull is what causes the object to slow down as it travels upwards.
* Eventually falling: The upward velocity decreases until it reaches zero, at which point the object starts falling back to the ground.
So, even though the object is moving upwards initially, gravity is constantly working against it.
