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

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
It is actually blue
All colours interfere to produce blue
In white light, the blue component dominates

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