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
None of these
Newton's second law of motion

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Engineering Mechanics
Angle of friction is the

The ratio of minimum friction force to the friction force acting when the body is just about to move
The ratio of minimum friction force to friction force acting when the body is in motion
Angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction

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