A 20-Kg Block Slides Down a Fixed,rough Curved Track

question 47

Multiple Choice

A 2.0-kg block slides down a fixed,rough curved track.The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m.Assume the block starts from rest.What is the change in mechanical energy of the block caused by the force of friction during this descent?

• A)-14 J
• B)-12 J
• C)-10 J
• D)-16 J
• E)-25 J

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