Prove that newton\'s 2nd law is the real law of motion.

1.	Prove that newton\'s 2nd law is the real law of motion.
Answer» Newton second law is real law of motion because we can derive Newton 1st law from Newton third law.To prove first law:We know, F=maIf no force act on Body So, F=0ma=0=>a=0/m0=aOR a=0It indicates either body is at rest or moving with constant speed which is first law of motion To prove third law:-F=dp/dt___1Let f\' is acting on 2nd body:-f\'=dp\'/dt____2Add 1 and 2:F+F\'=dp/dt+dp\'/dt F+F\'=d/dt(p+p\') F+F\'=d/dt(constant) F+F\'=d/dt(0)F+F\'=0F=-F\'Hence, action and reaction are equal and opposite direction

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