mgh=mV^2/2
V^2=2gh
h=V^2/2g
h=20^2/20=20 м
E=mgh
E=0.5*10*20=100 Дж
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mgh=mV^2/2
V^2=2gh
h=V^2/2g
h=20^2/20=20 м
E=mgh
E=0.5*10*20=100 Дж