Engineering Mechanics
When two elastic bodies collide with each other,

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
The two bodies begin to regain their original shape

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Engineering Mechanics
Angle of friction is the

Ratio of limiting friction and normal reaction
Angle between normal reaction and the resultant of normal reaction and the limiting friction
The ratio of minimum friction force to the friction force acting when the body is just about to move
The ratio of minimum friction force to friction force acting when the body is in motion

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the vertical components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero
All of these
Algebraic sum of the horizontal components of all the forces should be zero

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