Homework Help: physics

Posted by kevin on Wednesday, March 7, 2012 at 10:14pm.

Josh starts his sled at the top of a 2.0 m-high 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, Thursday, March 8, 2012 at 1:02am
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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