figure shows two block system 4 kg block rests on a smooth horizontal surface upper surface of 4 kg is rough a block of mass 2 kg is placed on a surface surface the acceleration of upper Block with respect to earth when 4 kg mass is pulled by a force of 13 newton is

Dear Student 
as the frictional force acting on 2kg block is 0.8x 2 x 10 = 16N 
as its less than the force applied that is 30N 
So its solution is 

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