Механическая работа, энергия, мощность. КПД
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![Механическая работа [Физзадачи #28]](https://sun9-26.userapi.com/FuqCAzj-6EV9wRxELn5Bo0bu5VqkPFEqyfgTgw/BqgYBeI7wYY.jpg)
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