A system consists of three masses m1 , m2 and m3 connected by a string passing over a pulley P

A system consists of three masses m1 , m2 and m3 connected by a string passing over a pulley P . The mass m3 hangs freely and m2 and m1 are on a rough horizontal table (the coefficient of friction = μ ) . The pulley is frictionless and of negligible mass. The downward acceleration of mass m3 is: (Assume m1 = m2 = m3 = m ) NEET 2014
(g(1−"μ" ))/9
2g"μ" /3
(g(1−2"μ" ))/3
(g(1−2"μ" ))/2