A baseball pitcher makes a big mistake and throws the ball straight up. If it reaches a maximum height of 15 m find... a. the initial velocity he threw it up with. b. the total time the ball spent in the air. c. the ball's velocities when its displacement was equal to 8.0 m. d. the times when the ball was 8.0 m above the ground. e. the time between throw and impact. f. his displacement when it is traveling at -34.7 m/s