If the machine doesn't decrease the amount of work that you do, it might still improve the quality of the final result of your efforts
All of these can provide voltage. a battery is a generator, and plugging in to an electrical outlet is just like your phone charger or TV..
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50m/s
I divided the 200m by 4s (so 200/4) to get 50m per second
The drop of purple food dye will sink to the bottom while expanding around the cup turning the water purple