The loss of kinetic energy, during inelastic impact of two bodies having masses m1 and m2, which are moving with velocity v1 and v2 respectively, is given by
1
\(\frac{{{m_1}{m_2}}}{{2\left( {{m_1} + {m_2}} \right)}}{\left( {{v_1} - {v_2}} \right)^2}\)
2
\(\frac{{2\left( {{m_1} + {m_2}} \right)}}{{{m_1}{m_2}}}{\left( {{v_1} - {v_2}} \right)^2}\)
3
\(\frac{{{m_1}{m_2}}}{{2\left( {{m_1} + {m_2}} \right)}}\left( {v_1^2 - v_2^2} \right)\)
4
\(\frac{{2\left( {{m_1} + {m_2}} \right)}}{{{m_1}{m_2}}}\left( {v_1^2 - v_2^2} \right)\)