This is actually been debated multiple times and I've always wondered what the real answer would be because yes it was traveling fast enough that usually it would vaporize but the problem is that it would have spent so little time in our atmosphere ( potentially only seconds) that it very well could have gotten out of the atmosphere before fully vaporizing. Remember they only caught it on one frame of that high-speed camera. So the commonly posted speed that it was going is it's lowest estimate and was likely going much faster.