Multiple Choice
A mass attached to the end of a spring is pulled out and released on a surface with friction.The work 
Done on the mass by the force exerted by the spring
A) never has the same sign as the change in energy owing to friction.
B) always has the same sign as the change in energy owing to friction.
C) has the same sign as the change in energy owing to friction during one half of each cycle.
D) never has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.
E) always has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.
Correct Answer:
Verified
Correct Answer:
Verified
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