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
Answer: C
Physics & Space Science
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b.
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