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General
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Question

Three blocks A,B, and C of equal mass m are placed one over the other, one on a smooth horizontal ground as shown in figure. Cefixime of friction between any two blocks of A,B and C is 0.5. What would he the maximum value of mass of block D so that the blocks A,B and C move without slipping over each other '?

  1. 3 m    
  2. 5 m    
  3. 6 m    
  4. 4 m    

The correct answer is: 3 m

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