People do that all the time. It's called 'base jumping,' and it depends entirely on what one is wearing: wing suit or parachute. Oh, and it also depends upon whether one is willing to deal with the legal consequences of making it down alive. It's not legal most places.
............and y'know what? I honestly don't know about anybody passing a law against something that isn't physically possible.
Oh, yeah....and I have personally walked on water, and we can even arrange virgin births. We haven't split any seas yet, or changed water into wine (except by the slow way), but we DO heal lepers and by the standards of Jesus' time, we can certainly revive the dead. We're working on the 'make the lame to walk' bit, and are quite successful at it. We can even cause blind men to see, and the deaf to hear.
So it would be a good idea not to characterize all of the miracles of the Bible as 'physically impossible.' Quite a few of them are not; it is just a matter of knowing how to do it.