Applied Mechanics and Graphic Statics
A cube on a smooth horizontal surface

Cannot be in unstable equilibrium
Cannot be in neutral equilibrium
Cannot be in stable equilibrium
Can be in any of these states

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Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

All listed here
Attempt to regain its original shape due to their elasticities
Immediately after collision come momentarily to rest
Tend to compress each other till they are compressed maximum possible

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