FRICTION#3| PROBLEM SOLVING| ENGINEERING MECHANICS

Hey Guys!!!
This is Zainali and I am back with a new tutorial in which we would be solving a problem regarding Friction.
Problem Statement: The block of the weight W1=1290N rests on a horizontal surface and supports another block of weight W2=570 N on top as shown. Block of weight W2 is attached to vertical wall by an inclined string AB. Find the force P applied to the lower block that will be necessary to cause the slipping to impend. Coefficient of friction between W1 and W2= 0.25 and that of block and horizontal plane surface=0.40

I have tried my best to explain the above mentioned problem.
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[meharinminnu]

Thank you sir...i really got the concept 😊❤

[jointentranceexamination]

Sir but we should not add normal force weight of block 2 will act on block 1 so asper that 864N is the right answer.