ЗСЭ
mgh=kh^2/2+mv^2/2
mv^2=2mgh-kh^2
v=sqrt((2mgh-kh^2)/m)=sqrt(2gh-k/m*h^2)=sqrt(2*10*1-20/5*1)=sqrt(20-4)=4 m/s
ЗСЭ
mgh=kh^2/2+mv^2/2
mv^2=2mgh-kh^2
v=sqrt((2mgh-kh^2)/m)=sqrt(2gh-k/m*h^2)=sqrt(2*10*1-20/5*1)=sqrt(20-4)=4 m/s