Law of conservation

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Newtons first law pf motion derived that force on any substance is zero the substance will propagate in same velocity by a straight line. Hence velocity is constant with time. Therefore the momentum will be constant with time. That follows the law of conservation of momentum. But from the definition of momentum we know that momentum is the multiplication of mass and velocity. With the increasing of mass the momentum will be increases. Again with the increasing of velocity the momentum will be increases. The law of conservation of momentum may states as "when the net force on any system is equal to zero then the sum of total momentum will follow the conservative nature".

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