Aplane accelerates down a runway. the plane accelerates at 2 m/s/s for 10 seconds and obtains a speed of 20 m/s. what speed would a second plane obtain if it had double the acceleration for double the time of the first plane? a) 20 m/s b) 40 m/s c) 80 m/s d) 160 m/s

Cis the

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