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Question

A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2 while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be :

  1. 900 N    
  2. 100 N    
  3. 1100 N    
  4. 1200 N    

The correct answer is: 1100 N

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