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

F.B.D. of the blocks A, B and CConditions of forces on B and C arc same so they both will move with same downward acceleration a. The block A moves with the same acceleration a upwards From block A: 2T−40=4a   …….(i) From block B or C:30−T=3a  ……..(ii) From above two equations a=2m/s2