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OK SO, you can make a triangle and figure out that 283 N are pulling horrizontal and 283 pulling vertically. But im not sure how to plug any of that into the

F=(Friction coef)N

where F is force of friction, and N is normal force...

How do i find the coeff. of static fricton?

Another one that is similar is the following:

In grass-skiing, a man goes down at 92 Km/hr. It takes him 6.6 to reach that speed from rest at a 35 degree incline. His mass is 75 Kg. What is the coeffcient of friction between the grass and his skis that day?

I'm totally lost....help please!?