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The question now is what's causing this unknown force,
which I've labeled with a question mark subscript.
We know that this force is being caused by gravity and the mutual attraction of all objects,
so gravity is pulling this down, but I don't know what's causing this.
Is the cause of this unknown force some sort of antigravity
or is it a gravitational attraction to something above the ball?
Maybe Galileo's hand or something out in space.
Or is the ground somehow pushing upwards on the ball
Choose what you think is the best answer.
And, again, don't worry if you get this one wrong. This is to get you thinking.