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When a bullet is fired from a gun

  • A.The gun moves forward
  • B.The gun jumps up
  • C.The gun does not move
  • D.The gun recoils with the same momentum as the bullet

Answer: D

The gun recoils with the same momentum as the bullet.

Momentum is conserved, and the system was at rest, so \[m_b v_b = m_g v_g\] The gun's momentum is equal in magnitude and opposite in direction. Being much heavier, it moves back far more slowly.

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