A man pushes his child in a grocery cart to the left the total mass of the cart and child is 45.0 kg if the friction force resisting this cart’s motion is 15.0N, how hard does the man have to push so that the cart accelerates at 0.50 m/s/s

Iknow the first part it is the average star i am not 100% sure

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

What the heck r u talkin bout? ?