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A body of mass $2 \mathrm{~kg}$ moving with a velocity of $3 \mathrm{~m} / \mathrm{sec}$ collides head on with a body of mass $1 \mathrm{~kg}$ moving in opposite direction with a velocity of $4 \mathrm{~m} / \mathrm{sec}$. After collision, two bodies stick together and move with a common velocity which in $\mathrm{m} / \mathrm{sec}$ is equal to
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$2 / 3$
$\begin{gathered}m_1 v_1-m_2 v_2=\left(m_1+m_2\right) v \\ \Rightarrow 2 \times 3-1 \times 4=(2+1) v \Rightarrow v=\frac{2}{3} m / s\end{gathered}$
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