19.5 J 10. A ball is traveling at 20 m/s and has a kinetic energy of 40 J. Calculate the mass of
the ball.
a) 8.6 kg
b) 0.2 kg
c) 34.6 kg

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

The correct answer should be b let me know if i’m wrong