According to my calculations, derived from the time bongo cat takes to slap the chicken, and the velocity, 1665.65 mps. The time it takes for the arm to go from an upright position to on the table is one frame, assuming most videos are at 60fps, we can deduce that bongo cat completes this action in 1/60th of a second. Therefore the displacement of the tip of the arm is equal to

1/60 * 1665.65 which is 27.76 meters . Now a visual approximation of the angular movement of bongo cats arm gives us a change of roughly 69 degrees from upright to down. Now by using basic trig, bongo cats arm is equal to 27.76/sin(69) which comes out to be 29.73 meters.

There you have it, the length of bongo cats arm