In the system shown, block A is of mass 4.0 kg and blocks B and C are of equal mass each of 3 kg. Find the acceleration in m/s2 of block C, if the system is set free. g=10m/s2

FBD of the blocks A, B and C Conditions of forces on B and C are same so they both will move with same downward acceleration 'a'. The block A moves with the same acceleration a upwardsFrom block A : 2T−40=4a               …(i)From block B or C : 30−T=3a         …(ii)From above two equations a=2m/s2