TS EAMCET 03 May 2019 Shift 1 Solved Paper

Consider a system of blocks X. A and B as shown in the figure. The blocks A and B have equal mass and are connected by a massless string through a massless pully. The coefficient of friction between block A & X and B & X is 0.5. If block ‘X' moves on horizontal frictionless surface, what should be its minimum acceleration such that blocks A and B remain stationary,
(g = acceleration due to gravity)