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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C
Density of the substance to the density of water at 0°C

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