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A body of mass 6kg travelling with a velocity 10m/s collides head on and elastically with a body of mass 4kg travelling at a speed of 5m/s in opposite

direction. the velocity of the second body after collision is


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M₁ = 6kg
u₁ = 10m/s
m₂ = 4 kg
u₂ = -5 m/s
v₂ = ?

v_2= \frac{u_2(m_2-m_1)+2m_1u_1}{m_1+m_2} \\ \\ \Rightarrow v_2= \frac{-5(4-6)+2 \times 6 \times 10}{4+6} \\ \\ \Rightarrow v_2= \frac{10+120}{10} \\ \\ \Rightarrow v_2= 13\ m/s
2 5 2
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