Physics-
General
Easy

Question

Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure. The coefficients of friction between the floor and the blocks are as mu subscript s end subscript equals mu subscript k end subscript equals 0.4. Block A is pushed by an external force F. The value of F can be changed. When the welding between block A and ground breaks, block A will start pressing block B and when welding of B also breaks, block B will start pressing the vertical wall minus If F equals 20 N, with how much force does block A presses the block B

  1. 10 N    
  2. 20 N    
  3. 30 N    
  4. Zero    

The correct answer is: Zero

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