An unknown nucleus of mass $m_1$ collides with a stationary ${}^4He$ nucleus of mass $m_2$. After the collision,the two nuclei travel in perpendicular directions relative to each other. If kinetic energy is lost in the collision,the unknown nucleus must be:

  • A
    ${}^{28}N$
  • B
    ${}^4He$
  • C
    ${}^{12}C$
  • D
    $A$ nucleus with mass lighter than ${}^4He$

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