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A soccer ball is kicked from the ground with an initial speed of 19.1 m/s at an upward angle of 45°. A player 50.0 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before it hits the ground? (Consider up and the direction of the ball's initial motion to be the positive y and x directions.)

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