A 22-Kg Block Starts from Rest on a Rough Inclined Plane

question 35

Multiple Choice

A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25 ° with the horizontal. The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by:

• A) 0
• B) -9.8 J
• C) 9.8 J
• D) -18 J
• E) 18 J

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