If Calliope stands at the base of a hill and tosses a ball straight up into the air, what will Dax, who is standing on top of the hill, see happen to the ball?

Provide a very brief response.
Dax will see the ball go up and then come back down. The reasoning is simple: When Calliope throws the ball upwards, gravity will act upon it. Regardless of Dax's elevated position on the hill, gravity works the same way and will pull the ball back towards the Earth after it reaches the peak of its trajectory. So, from his perspective on top of the hill, Dax will observe the ball rise and then descend, following a parabolic path.