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

Question

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

Quizplus · Accepted Answer

The Answer of 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

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