Ek=m*V^2/2 V=sqrt(2*Ek/m)=sqrt(2*2/0,04)=10 м/с V=V0-g*t t=(V0-V)/g=(20-10)/10=2 c
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Ek=m*V^2/2 V=sqrt(2*Ek/m)=sqrt(2*2/0,04)=10 м/с V=V0-g*t t=(V0-V)/g=(20-10)/10=2 c