A playground is on the flat roof of a city school, 6.5 m abovethe street below (see figure). The vertical wall of the building ish = 7.80 m high, forming a 1.3-m-high railing around theplayground. A ball has fallen to the street below, and a passerbyreturns it by launching it at an angle of θ = 53.0° above thehorizontal at a point d = 24.0 m from the base of the buildingwall. The ball takes 2.20 s to reach a point vertically above thewall. (a) Find the speed at which the ball was launched. (Give youranswer to two decimal places to reduce rounding errors in laterparts.) m/s (b) Find the vertical distance by which the ball clearsthe wall. m (c) Find the horizontal distance from the wall to thepoint on the roof where the ball lands.
