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Q.

A block A of mass 2kg rests on another block B of mass 8kg which rests on a horizontal floor as shown in figure. The coefficeint of friction between A and B is 0.2, while that between B and the floor is 0.5. When a horizontal force of 25N is applied on B, the force (in N) of friction between A and B is

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Detailed Solution

The maximum static friction from the ground,

fs=0.5(10)10=50N

As the applied force is less than this, the blocks will remain at rest and have no tendency of slipping.

So the friction between A and B will be zero.

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