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

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

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Sum of resolved parts in any two directions at right angles, are both zero
Two resolved parts in any two directions at right angles are equal
Algebraic sum of the forces is zero
Algebraic sum of the moments of the forces about the point is zero

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