A 90-Kg Box of Oranges Slides from Rest Down a Frictionless

Multiple Choice

A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A.
-What is the coefficient of kinetic friction, $\mu$ _k, of the surface from A to B?

A) 0.11
B) 0.26
C) 0.33
D) 0.47
E) 0.52