Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's third law of motion
Newton's first law of motion
Newton's second law of motion
None of these

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of moments of all the forces about any point should be zero
Algebraic sum of the horizontal components of all the forces should be zero
All of these
Algebraic sum of the vertical components of all the forces should be zero

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