Which of the following scenarios best illustrates the principle of conservation of momentum?
When a bullet is fired from a gun, the gun recoils in the opposite direction.
The total momentum of a system stays constant when no external force acts on it.
Before firing, the gun and bullet are at rest (total momentum zero). After firing, the bullet moves forward and the gun moves backward with equal and opposite momentum, so the total stays zero – this is recoil.
The other examples involve gravity or friction acting from outside.
Hence, When a bullet is fired from a gun, the gun recoils in the opposite direction..
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