I did something similar on my banshee, but i was only in fourth gear when it happend, and i hit the tree with almost that much speed, you're right, everything seems to go into sloooowwww motion. and the brakes were all locked up. I got thrown over the front, only to be watching the shee do a front flip while im upside down. i ended up crunchin the frame down almost on the axle, i bent the steering stem, folded itp .190 rims onto the rotor, and bent 1 a-arm, it wasn't a good day for me when i did that.