Chapter 4: 1. A ball is thrown from a window, directly upwards, at a speed of 28.0 m/s. The window is 55.0 m above the ground. Use conservation of energy to find a) The maximum height above ground that it will reach. /4] b) Its speed as it hits the ground. [ /4] c) If the ball is initially thrown at an angle, with the same speed of 28.0 m/s, does that affect the answer to part (b) ? Explain why or why not. /2]