Applied Mechanics and Graphic Statics
Newton’s Law of Motion is:

To every action, there is always an equal and opposite reaction
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
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Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force

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

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

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