A playground is on the flat roof of a city school, h = 6.00 m above the street below (see figure). The vertical wall of the building is h = 7.50 m high, to form 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 8 = 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. Ⓡ

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