Question

why Newton second law is called real law​

Answer 1

This means if a body is at rest, it remains at rest and if the body is moving in straight line with constant velocity, it continues to do so. This is what the first law states. Hence first law is contained in the second law. ... Therefore, Newtons' second law of motion is the real law of motion.

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Answer 2

Answer:

Because it contains both the first and third law of motion. Both the first and third laws can be proved using it.