46. A hydraulic jack with two pistons is shown in the figure. The radii are 10 cm and 5 cm, and the weights are 40 kg and 1 kg for the left and right piston, respectively. A ball weighs 9 kg is placed on the right piston. Find the height difference between two pistons in equilibrium status. (Gravitational acceleration g = 10 m/s2 ) (A) 0 cm (B) 10 cm (C) 1 m (D) 10 m (E) 20 m