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

question 18

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

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