Physics
The sky appears blue because

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

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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 metal ball suffers greater change in momentum
Both suffer the same 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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