1. a 1000-kg car moves as speed from 10 m/s to 30 m/s in 20 seconds. what is the average speed? what is the acceleration? what is the average force acting upon it? if the car turns along a circle at speed 5 m/s around a curve 30 meters in radius, how big the centripetal force is needed?

Ithink it’s cancer risk

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