Three blocks of masses m1, m2 and m3 are connected by mass less unstretchable strings on a smooth surface. Tension T2, is

Acceleration, a = Fm1+m2+m3                        = 4010+6+4 = 2 ms-2Tension T2 = (m1+m2)a                   = (10 + 6)2 = 32 N