A 12-Kg Mass Is Projected Down a Rough Circular Track (Radius

question 75

Multiple Choice

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown.The speed of the mass at point A is 3.2 m/s,and at point B,it is 6.0 m/s.What is the change in mechanical energy done on the system between A and B by the force of friction?

• A)−8.9 J
• B)−7.3 J
• C)−8.1 J
• D)−6.6 J
• E)−24 J

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