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A block A of mass m is placed over a plank B of mass 2m. Plank B is placed over a smooth horizontal surface. The coefficient of friction between A and B is 0.5. Block A is given a velocity v0 towards right. Acceleration of B relative to A is

  1. fraction numerator g over denominator 2 end fraction    
  2. g    
  3. fraction numerator 3 g over denominator 4 end fraction    
  4. zero    

The correct answer is: fraction numerator 3 g over denominator 4 end fraction

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