You throw a ball straight up in the air and observe that it just reaches the top of a building 8.0 meters above you before it begins to fall back down. (a) How fast did you throw the ball initially? (b) How long is the ball in the air before coming back down to your level? (c) If you then throw the ball straight up twice as fast, how far would it rise and (d) how long would it remain in the air