<Còn em nè anh>
Đổi : 20 tấn =20000 kg ; 30 tấn =30000 kg
\(\dfrac{v}{v'}=\dfrac{\sqrt{2as}}{\sqrt{2a's}}=\dfrac{\sqrt{\dfrac{F}{m_1}}}{\sqrt{\dfrac{F}{m_1+m_2}}}=\dfrac{\sqrt{\dfrac{1}{30000}}}{\sqrt{\dfrac{1}{30000+20000}}}=\sqrt{\dfrac{5}{3}}\)
\(\Rightarrow v'=\dfrac{\sqrt{3}\cdot v}{\sqrt{5}}=\dfrac{\sqrt{3}\cdot1,5}{\sqrt{5}}=\dfrac{3\sqrt{15}}{10}\left(\dfrac{m}{s}\right)=1,1618\left(\dfrac{m}{s}\right)\)
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