A small ball, attached to a string, is spun in a perfect circle with radius r. If the radius of the circle is 30 cm and the ball travels half the circumference of the circle in 0.5 seconds, what is the velocity of the ball rounded to the nearest whole number?

The answer is as follows in the photo

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

Idk just need points

One answer could be erosion