Find the current through a 20ohm resistance, and current through a 40ohm resistance

Is this a question of an answer

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

You need to calculate the string in between two masses