Physics-
General
Easy

Question

In the arrangement shown in the figure, mass of the block B and A is 2m and m respectively. Surface between B and floor is smooth. The block B is connected to the block C by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block C so that block A remains stationary w.r.t. B. Coefficient of friction between A and B is m :

  1. fraction numerator m over denominator mu end fraction    
  2. fraction numerator 2 m plus 1 over denominator mu plus 1 end fraction    
  3. fraction numerator 3 m over denominator mu minus 1 end fraction    
  4. fraction numerator 6 m over denominator mu plus 1 end fraction    

The correct answer is: fraction numerator 3 m over denominator mu minus 1 end fraction

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