This image of a tennis ball smashed to half its normal diameter was captured using a sound trigger that was positioned about a foot below the racket. The most difficult part of taking the photo was hitting the ball dead center in the dark. Note the distortion in the strings of the racket. This shows that the ball exerts a force on the racket while the racket exerts an opposite force on the ball. Why don't the strings distort as much as the ball?