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

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

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same
Algebraic sum of forces, constituting a couple is zero

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