A place kicker A executes a “pooch” kick, which is designed to eliminate a potential return by the receiving team. The “pooch” kick features a high trajectory and short range, thereby preventing the deep kick returner B from reaching his maximum speed before encountering coverage. To offset this, player B hesitates for 1.15 sec after the ball is kicked, and then accelerates at a uniform rate, reaching his maximum speed at the instant he catches the ball. Determine the velocity of the football relative to the receiver at the instant the catch is made if the football is caught when it is 4.5 ft above the playing surface.

y B 70 ft/sec 50 L--x -60 yd- Problem 2/204