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Ответ

Ответ дан
varr88

Eк=mV^2/2

Eп=mgh

Eк=2*30^2/2=2*900/2=900 Дж

т.к скорость равна 30 м/с,а нам надо посчитать кинетическую за время = 1с,значит h=30 м

Eп=2*10*30=600 Дж

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