<span><span>КПД=<span>Асов/Апол;</span></span></span>
<span><span><span>Апол=m*g*h; где m-масса, g-постоянная величина, h-высота.</span></span></span>
<span><span><span>Апол=75*10*10=7500Дж</span></span></span>
<span><span><span>Асов=Fh=Апол/КПД=12500Дж</span></span></span>
<span><span><span><span><span><span>Асов=Fh</span></span></span>; F=Асов/h=12500/20=625Н</span></span></span>
<span><span><span>ОТВЕТ: 7500Дж, 625Н.
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