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Question

Two identical blocks each of mass m being interconnected by a light spring of stiffness k is pushed by a force F as shown in the figure. The maximum potential energy stored in the spring is equal to:

  1. fraction numerator F to the power of 2 end exponent over denominator 2 k end fraction    
  2. fraction numerator F to the power of 2 end exponent over denominator 4 k end fraction    
  3. fraction numerator F to the power of 2 end exponent over denominator 8 k end fraction    
  4. None of these    

The correct answer is: fraction numerator F to the power of 2 end exponent over denominator 2 k end fraction

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