A Training Shoe Is Raised on a Hinged Surface (Inclined

A training shoe is raised on a hinged surface (inclined plane) , until it begins to slide. Immediately before the shoe begins to slide the angle of the surface to the horizontal is 47°. What is the coefficient of static friction (µs) between the shoe and the surface?

A) 0.123
B) 0.731
C) 0.682
D) 1.072
E) -0.124