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You throw a ball vertically upward from the roof of a tall building.
The ball leaves your hand at a point even with the roof railing with
an upward speed of 15.0 m/s; the ball is then in free fall. On its
way back down, it just misses the railing. Find the ball's posi-
tion and velocity 1.00 s and 4.00 s after leaving your hand