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

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

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Applied Mechanics and Graphic Statics
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

The diagonal of the parallelogram which does not pass through the point of intersection of the forces
The diagonal of the parallelogram which passes through the point of intersection of the forces
Its longer side
Its shorter side

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