Е1=Е2
mgh=mv^2/2
Eполная=mgh+mv^2/2=2mgh
Eполная`=mv^2/2
mv^2/2=2mgh
v^2/2=2gh
h=v^2/4g=20^2/(4*10)=400/40=10(м)
Е1=Е2
mgh=mv^2/2
Eполная=mgh+mv^2/2=2mgh
Eполная`=mv^2/2
mv^2/2=2mgh
v^2/2=2gh
h=v^2/4g=20^2/(4*10)=400/40=10(м)