Engineering Mechanics
When two elastic bodies collide with each other,

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

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Engineering Mechanics
The static friction

Always acts in a direction, opposite to that in which the body tends to move
Is independent of the area of contact, between the two surfaces
All of these
Bears a constant ratio to the normal reaction between the two surfaces

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