How can we derive Newton's first & third law from SECOND LAW?
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first law _lts State: A body continue in its State of rest or of uniform motion in a straight line , unless compelled by some applied unbalanced force to change its State of rest or of uniform motion.
second law- it's State : The rate of change of momentum of a body is directly proportional to the applied unbalanced force and this change take place always in the direction of applied force.
and change in linear momentum of A = F2×t
Total change in linear momentum = f1t+f2t.
As no external force is acting on the system, hence according to second law of motion
f1t+f2t=0
f1 =-f2
action=-resction
second law- it's State : The rate of change of momentum of a body is directly proportional to the applied unbalanced force and this change take place always in the direction of applied force.
and change in linear momentum of A = F2×t
Total change in linear momentum = f1t+f2t.
As no external force is acting on the system, hence according to second law of motion
f1t+f2t=0
f1 =-f2
action=-resction
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