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31.
Based on the graph to the right, the spring constant is

A.    0.33 N/m

B.    33 N/m

C.    3.0 m/N

D.   0.030 m/N
    
                            F
F = kd   =>  k = ---
                           d

  
Read the force and the displacement at the same point and substitute into the equation.

  
          20 N
k = ------------ =  33 N/m
        0.60 m