The boy A is moving in a straight line away from the building at a constant speed v4. The boy C throws the ball B horizontally when A is at d. At what speed must C throw the ball so that A can catch it? Also determine the relative speed of the ball with respect to boy A at the instant the catch is made. Given: v4 = 4 ft/s , d = 10 ft , h = 20 ft , g = 32.2ft/s

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