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In one dimensional elastic collison of e...

In one dimensional elastic collison of equla masses, the velocities are interchanged. Can velocities ina one dimensional collision be interchanged if the masses are not equal?

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`v_1^()'=((m_1-m_2)/(m_1+m_2))v_1+((2m_2)/(m_1+m_2))v_2`
We can see that `v_1^()'=v_2` only if `m_1=m_2`
Similarly `v_2^()'=v_1` is `m_1=m_2`.
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