Block A of mass 2m,B and C each of mass m are in equilibrium at rest as shown in figure.Assume the spring balance,pulley and string to be ideal.Now,an additional force mg is applied on block C in downward direction .Find the new reading of the spring balance (a) 5/2 mg (b) 5/3 mg (c) 5/4 mg (d) None of these Share with your friends Share 15 Ved Prakash Lakhera answered this In the beginning the system is in equilibrium. When additional force mg acts on mass of block C then, ma=2mg-T-----1and ma = T-mg----2from eqn 1 and 2 we get, 2ma = mgor a = g/2 Now eqn of motion for block A is given by, 2ma =T-2mgPutting the value of a in above eqn, we get, T =2ma+2mg=2m×g/2 +2mg =3mg.Therefore answer D none of these is correct. -12 View Full Answer