Physics
When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?

Hydrogen bond formation
Dipole interaction
Covalent attraction
Vander waals forces

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

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