Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

120 N
20 N
None of the listed here
40 N

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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

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

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