4kg . B 6kg A simple Arwood's machine is shown in the diagram above. It is composed of a frictionless lightweight pulley with two cubes connected by a light string. If cube A has a mass of 4.0 kg and cube B has a mass of 6.0 kg, the system will move such that cube B accelerates downwards. What would be the tension in the two parts of the string between the pulley and the cubes? (A) TA=47 N; T =71 N (B) TA=47 N; TB =47 N (C) TA=47 N: TB = 42 N (D) TA= 39 N: TB = 39 N