physics
posted by kevin .
Josh starts his sled at the top of a 2.0 mhigh hill that has a constant slope of 25 degrees . After reaching the bottom, he slides across a horizontal patch of snow. The hill is frictionless, but the coefficient of kinetic friction between his sled and the snow is 0.07.

physics 
drwls
If the snow on hill is frictionless it should also be frictionless on the level patch. This is a very artificial contrived problem. But let's do it anyway.
KE at bottom = M g H = Friction * (slide distance X)
M g H = M g*0.07*X
X = H/0.07 = 28.5 meters
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