Engineering Mechanics
The algebraic sum of moments of the forces forming couple about any point in their plane is

Constant
Both of above are wrong
Both of above are correct
Equal to the moment of the couple

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

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