Engineering Mechanics
When two elastic bodies collide with each other,

The two bodies begin to regain their original shape
The two bodies tend to compress and deform at the surface of contact
All of these
The two bodies will momentarily come to rest after collision

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Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero
Their lines of action are at equal distances
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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