Here's why:
* Gravity: The primary force acting on the object is gravity, constantly pulling it downwards.
* Upward Motion: When the object is thrown upwards, its initial velocity is positive, meaning it's moving upwards.
* Slowing Down: As the object travels upwards, gravity works against its motion, causing it to slow down.
* Highest Point: At the highest point, the object momentarily stops moving upwards. Its velocity becomes zero.
* Downward Motion: Immediately after reaching the highest point, the object starts to fall back down, gaining velocity in the downward direction.
Let me know if you have any other physics questions!