Here's a problem to solve: Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

Among the 4 following options, which is the correct answer?

- A: The ball goes up at a constant speed, stops, then comes down at a constant speed.
 
- B: The ball goes up at a constant speed, stops, and increases speed as it comes down.
 
- C: The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
 
- D: The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.
 