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

question 70

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 speed of the box just before it reaches point A?

• A)98 m/s
• B)21 m/s
• C)9.9 m/s
• D)5.7 m/s
• E)4.4 m/s

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