Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of energy
Conservation of mass
Conservation of momentum
Conservation of charge

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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

Both suffer the same 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
The rubber ball suffers greater change in momentum

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