My problem states, that a ball is thrown from the top of a building. At the same instance a person is running on the ground at a distance of 32.6 m away from the building. I have to find the average speed the runner must be traveling to catch the ball at the bottom of the building. So far I have calculated everything related to the ball. As in how long it was in the air, it's velocity, and it's maximum height. All calculations I believe are correct. Now, however, I'm stuck in that I don't know what to do next. I know I need to find the average speed the runner must be going. So I'm assuming that the velocity of the ball and the time the ball is in the air will play a factor in this. I'm just stuck I don't know where to go from here.