Ek=m*V^2/2 V=sqrt(2*Ek/m)=sqrt(2*40*10^3/3*10^3)=5,2 м/с
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Ek=m*V^2/2 V=sqrt(2*Ek/m)=sqrt(2*40*10^3/3*10^3)=5,2 м/с