Question

Derive the law of conservation of linear momentum from Newton’s third law.​

Answer 1

Explanation:

Derivation of Conservation of Momentum

Applying Newton's third law, these two impulsive forces are equal and opposite i.e. F21=−F12. If the time of contact is t, the impulse of the force F21 is equal to the change in momentum of the first object. F21t=m1v1−m1u1.

Answer 2

Newton's third law states that for a force applied by an object A on object B, object B exerts back an equal force in magnitude, but opposite in direction. This idea was used by Newton to derive the law of conservation of momentum. ... B=m_{2}(v_{2}-u_{2}) (change in momentum of particle B)