Batman's Cape is Fatally Flawed: When is comes to comic books there is no end to commentary. We can pull apart, dissect, digest and conject to our hearts content, but when we enter the realm of comic book science, there's a whole new level of geekery.
According to students at the University of Leicester, Batman's flying cape (from the Christopher Nolan Batman reboot trilogy) would cause him to hit the ground at 50 mph. While he is athletic, this would likely cause fatal injuries.
According to PhysOrg, "If Batman jumped from a building 150 meters high, he could glide a distance of around 350 meters – but the problem arises as Batman's velocity increases during his descent. His velocity would initially rise to around 68 miles per hour, before reaching a steady 50 miles per hour as he gets down to ground level – a speed too fast for him to land safely." via PhysOrg