A mass m = 50 kg is attached to a light string which is wrapped around a cylindrical spool of radius R = 0.1 m and moment of inertia I = 4.0 kgᐧm2. The spool is suspended from the ceiling and the mass is released from rest a distance h = 5 m above the floor. How long does it take for the mass to hit the floor?

Sorry i don’t know what to do

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

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