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I was reading some text on coefficient of restitution when I encountered this , enter link description here

enter link description here In the following you all would notice that in Impulse of deformation for particle $m_2$ we can see that change in momentum would be $m_2v - m_2u_2 = m_2(v-u_2)$ but what about particle $m_1$. When we write change in momentum for $m_1$ it should have been $m_1v-m_1u_1$ ie: $m_1(v-u_1)$ but then why is it written $m_1(u_1-v)$ . The same thing is happening in the Impulse of reformation part. I can't seem to identify where I am going wrong in my explanation. So can somebody please give me the right explanation.

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The impulse on m1 is opposite and equal that was on m2 (action and relation pairs). Jd is the magnitude of impulse so actually -Jd = m1(v-u1) implying Jd = m1(u1-v)

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  • $\begingroup$ Oh ok thanks a lot $\endgroup$ – user198885 Aug 22 at 9:05

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