Physics
When a bullet is fired from a gun

The gun moves forward
The gun does not move
The gun recoils with the same momentum as the bullet
The gun jumps up

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
Both suffer the same change in momentum

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