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<math>p_{before} = p_{after}</math>
Since:
<math>p = mv</math>
Then:
{| class="wikitable"
|-
<math>m_1 v_1 + m_2 v_2 = (m_1 + m_2) v_3</math>
Where:
<math>m_1</math> = The [[mass]] of [[object]] 1.