Engineering Mechanics
During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

Greater than
Less than
Equal and opposite to
Equal to

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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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