Here is a link with ski injury data. http://www.ski-blog.com/2008/01/some...i_injurie.html
A few years ago I was in a ski school. I was clocked by a radar gun at 52 MPH on a steep intermediate trail. I was skiing in control. I am an expert skier. I had no idea that I was going that fast. I wasn't the fastest skier in the class that day. I think that the fastest skier went about 58 MPH.