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Which of the following is called a real law of motion?

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Which of the following is called a real law of motion?

(a) Second law

(b) First law

(c) Third law

(d) Law of inertia

The question was asked during an interview for a job.

This key question is from Effect of Gravity in portion Laws of Motion of Engineering Physics I

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The correct choice is (a) Second law

The explanation: First law is contained in the second law: In the absence of external force a body at rest will remain at rest and a body in motion will continue to move. Third law is contained in the second law: In the absence of external force, the rate of change of momentum must be zero. This is the third law of motion. As both first and second law are confined in the second law, it the real law of motion.

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