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
Correct Answer:
Verified
Correct Answer:
Verified
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