question_answer

A block A is kept on a block B. Friction between B and ground is negligible. \[{{\mu }_{s}}\] and \[{{\mu }_{K}}\] are the coefficients of static and kinetic friction between A and B, respectively. A horizontal force F is applied on A. \[{{a}_{1}}\] is the acceleration of B just before A slips on B and \[{{a}_{2}}\] is the acceleration of B after A slips on B. Assume \[{{\mu }_{s}}>{{\mu }_{K}}\]. Then

A) \[{{a}_{1}}>{{a}_{2}}\]         

B) \[{{a}_{1}}<{{a}_{2}}\]

C) \[{{a}_{1}}={{a}_{2}}\]                     

D) None of these