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
Equal and opposite to
Equal to
Less than

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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 lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero
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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Engineering Mechanics
The term 'Centroid' is

The same as centre of gravity
None of the listed here
The point of suspension
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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