28) A person initially at rest throws a ball upward at an angle 00 with an initial speed vo. He tries to catch up to the ball by accelerating with a constant acceleration a for a time interval At, and then continues to run at a constant speed for a time interval Atâ‚‚. He catches the ball at exactly the same height he threw the ball. Let g be the gravitational constant. What was the person's acceleration a?
