Physics-
General
Easy

Question

A block of mass m moving with a velocity V subscript 0 end subscript 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 To an observing A, the net work done on the block is
A) Standing on the horizontal surface
B) Standing on the block

  1. negative m v subscript 0 end subscript superscript 2 end superscript    
  2. plus m v subscript 0 end subscript superscript 2 end superscript    
  3. negative fraction numerator 1 over denominator 2 end fraction m v subscript 0 end subscript superscript 2 end superscript    
  4. zero    

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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