19-15. The 1.25-lb tennis racket has a center of gravity at G and a radius of gyration about G of k = 0.625 ft. Determine the position P where the ball must be hit so that 'no sting' is felt by the hand holding the racket, i.e., the horizontal force exerted by the racket on the hand is zero. 1 ft P Prob. 19-15