The system shown in Fig.6.215 is in equilibrium. Find the acceleration of the blocks A, B, and C, all of equal masses m at the instant when (assume spring to be ideal). a. The spring between ceiling and A is cut b. The string (inextensible) between A and B is cut. c. The spring between B and C is cut. Also find the tension in the string when the system is at rest and in the above three cases.