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A playground is on the flat roof of a city school, 5.6 m above the street below (see figure). The vertical wall of the building is h = 7.10 m high, forming a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of θ = 53.0°; above the horizontal at a point d = 24.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall.