1 answer:
            
              
              
                
                
Answer: 20,734.69 N/m
Explanation:
The elastic potential energy (ELPE) of the rubber band is given by

where
k is the spring constant
x = 0.035 m is the stretching of the rubber band
E = 12.7 J is the ELPE of the rubber band
Substituting the numbers and re-arranging the equation, we find

 
                                
             
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