A spring of negligible mass and spring constant k is attached to the wall on one end, and the other end is attached to the center of mass axis of a solid sphere of mass m and radius r. The spring is stretched a distance A from equilibrium and let go. The sphere rolls freely on a smooth surface. What is the rotational kinetic energy when the sphere is at the equilibrium position?
A) 
B) 
C) 
D) 
E) 
Correct Answer:
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