A ball is thrown upward from the top of a 21.3-m-tall building. The ball's initial speed is 12.3 m/s. At the same instant, a person is running on the ground at a distance of 35.6 m from the building. What must be the average speed of the person if he is to catch the ball at the bottom of the building? Please show all work and give answer in 3 significant figures! Thank you I will rate well
