K A person standing close to the edge on the top of a 160-foot building throws a baseball vertically upward. The quadratic function given below models the ball's height above the ground, s(t), in feet, t seconds after it was thrown. Complete parts (a) through (d). s(t)=-16t + 64t+160 After how many seconds does the ball reach its maximum height? What is the maximum height? The ball reaches its maximum height of feet after seconds.