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
Correct Answer:
Verified
Correct Answer:
Verified
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