Engineering Mechanics
The term 'Centroid' is

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

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Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Newton's first law of motion
Newton's second law of motion
Principle of conservation of momentum
Principle of conservation of energy

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