it would not matter how fast the second motor was because it is not using electricity to drive it it is using the other motor. the only thing that would limit it would be friction.
do you understand what he's trying to do at all? He's using the first motor as a GENERATOR (GENERATES ELECTRICITY) and he wants to use that electricity to run the second motor. And it would hardly create any electricity, so the second motor would be providing about 20% (at the very most) of the power that the first motor is making, which means that the first motor is gonna have to fight against the second motor to run at any decent speed
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