How fast would you need to fire a jammy dodger to decapitate a human?

I love how this is in the biology section, well to answer your question: you may have heard the tail, I you drop a coin from the peak of the empire state building it could go straight through a person, not really true, but is enough to kill that individual ... Due to the acceleration of that coin whilst in free fall (9.81ms^-1) but this is also due to the material of the object. Also the word decapitate means to rid the head of an individual. By lauching a jammy dodger at someone's head is unlikely to decapitate them even travelling at speeds around 3,000 mph, it would cause a considerable amount of damage though. But as you get more and more speed, the jammy dodger itself would eventually vaporise, and cause no harm At all. So can a jammy dodger decapitate someone, answer no. And even if it was, I haven't a clue why 1). You would want to decapitate someone with a jammy dodger and 2). How on earth you would make it travel at required speed ... Interesting question though hahaha