mgh=Fl+mv^2/2
mv^2/2=mgh-Fl
v^2=2/m(mgh-Fl)
v^2=2/80*(80*10*20-20*200)=300 (м^2/с^2)
v=17 м/с
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mgh=Fl+mv^2/2
mv^2/2=mgh-Fl
v^2=2/m(mgh-Fl)
v^2=2/80*(80*10*20-20*200)=300 (м^2/с^2)
v=17 м/с