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Question

A block of mass m moving with a velocity v0 on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers:
A: standing on the horizontal surface
B: standing on the block

To an observer A, the work done by the normal reaction N between the block and the spring on the block is

  1. zero    
  2. negative fraction numerator 1 over denominator 2 end fraction m v subscript 0 end subscript superscript 2 end superscript    
  3. plus fraction numerator 1 over denominator 2 end fraction m v subscript 0 end subscript superscript 2 end superscript    
  4. none of these    

The correct answer is: negative fraction numerator 1 over denominator 2 end fraction m v subscript 0 end subscript superscript 2 end superscript

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