Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Bears a constant ratio to their velocity of approach
Is equal to the sum of their velocities of approach
Is inversely proportional to their velocity of approach
Is directly proportional to their velocity of approach

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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
Attempt to regain its original shape due to their elasticities
Tend to compress each other till they are compressed maximum possible
All listed here

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

All listed here
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
To every action, there is always an equal and opposite reaction
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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