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

question 15

Multiple Choice

A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?

• A)−2.7 J
• B)−8.8 J
• C)−4.7 J
• D)−6.7 J
• E)−19 J

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