After starting from the position marked with the "x", a football receiver B runs the slant-in pattern shown, making a cut at P and
thereafter running with a constant speed vb = 7 m/s in the direction shown. The quarterback releases the ball with a horizontal velocity
of 30 m/s at the instant the receiver passes point P. Determine the angle α at which the quarterback must throw the ball, and the velocity of the ball relative to the receiver when the ball is caught. Neglect any vertical motion of the ball.