A playground is on the flat roof of a city school,4.6 m above the street below (see figure). The vertical wall of the building ish =6.10 m high, to form a1.5-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? = 53.0° above the horizontal at a pointd = 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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