Suppose an object is hanging from the end of a spring. Let the spring’s length when the object is hanging at rest be L. Now suppose we pull the object downward until the spring has been stretched a length of 2L. By what factor has the force that the spring is exerting on the object increased?
A. The spring force is the same in both cases.
B. 
times stronger
C. 2 times stronger
D. 4 times stronger
E. The answer depends on the spring’s relaxed length.
E. The answer depends on the spring’s relaxed length.
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