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block A of mass m reasts on a planck B of mass 3m which is free slide on a frictionless horizontal surface the cofficient of friction between the block and planck is 0.2 if a horizontal force force of magnitude 2mg is applied to the plank B the accelaration of A relative to the planck and related to the ground respectively are

block A of mass m reasts on a planck B of mass 3m which is free   slide  on a frictionless horizontal
surface the cofficient of friction  between the  block and planck  is 0.2  if  a horizontal force force of magnitude 2mg is applied to the plank B the accelaration of A relative to the planck and related to the ground respectively are

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