This is the basic premise of a physics question I have been attempting to solve over on the Physics SE. (I'm working on solving the actual science behind an old movie myth).
How hard a punch hits is determined by your hand's momentum, or the combination between mass and velocity. . . . What acceleration would Super Man need to achieve during his attack in order to impart enough force to punch his fist into/mostly through a human body?
Unfortunately, in order to solve this problem, I somehow need to figure out the amount of force needed for an object to enter/pass through the human body (by either passing through the sternum or directly below it). Since I have so far been unable to find anything helpful in online searches, and naturally I'm not about to test fire an object through human beings until I find the right amount of force, I'm asking for a little help from the experts on human biology... Does anyone know where I can find or how I can figure out this number?