A thin 1-m long rod has a 200-g object attached to one end and a 300-g object attached to the
other end. At what point should the rod be supported so that it remains in horizontal
equilibrium?
(A) 20 cm from the 300-g object
(B) 40 cm from the 300-g object
(C) 60 сm from the 300-g object
(D) 40 cm from the 200-g object