A playground is on the flat roof of a city school, hb = 6.40 m above the street below (see figure). The vertical wall of the building is h = 7.70 m high, to form a 1.3-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 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.   (a) Find the speed at which the ball was launched.  m/s =  (b) Find the vertical distance by which the ball clears the wall.  m = (c) Find the horizontal distance from the wall to the point on the roof where the ball lands.  m =

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Projectile Motion