A20-cm-long spring is attached to a wall. when pulled horizontally with a force of 100 n, the spring stretches to a length of 22 cm. the same spring is now suspended from a hook and a 10.2-kg block is attached to the bottom end. how long is the stretched spring in cm? (do not include unit in answer)

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

Attach the free body diagram and i will you answer the question.! : d