NEET 2015 Physics and Chemistry Cancelled Paper

A block A of mass m‌1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m‌2 is suspended. The coefficient of kinetic friction between the block and the table is µk.When the block A is sliding onthe table, the tension in the string is :-