Sitting in a second-story apartment, a physicist notices a ball moving straight upward just outside his/her window. The ball is visible for 0.25s as it moves a distance of 1.05m from the bottom to the top of the window. a) How long does it take before the ball reappears? b) What is the greatest height of the ball above the top of the window? Hey, I don't know how to approach these types of problems. Help?