A football running back runs 17 m straight down the playing field in 2.9 s (in the positive direction). He is then hit and forced 3.5 m straight backwards in 1.8 s. He breaks the tackle and runs straight forward another 17 m in 5.8 s. Calculate his average velocity (a) for each of the three intervals and (b) for the entire motion.

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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