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![[m_dv_d+m_uv_u]_b=[m_dv_d+m_uv_u]_a](/tpl/images/1388/8635/49abe.png)
in other words, the momentum before they collide has to be equal to the momentum after they collide. Knowing that the dragon is initially at rest:
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A 1000 kg dragon is at rest sleeping in outer space. A 50 kg unicorn runs into the dragon with a vel...
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