Physics
Instrument for measuring blueness of the sky or ocean is called ________

Bathymeter
Barometer
Ceraunograph
Cyanometer

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

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