Question

State and verify the law of conservation of linear momentum

Answer 1

Law of conservation of (linear) momentum: If the net external force acting on a system of bodies is zero, then the momentum of the system remains constant. ... If the net external force acting on a body is zero, then the rate of change of momentum is also zero, which means that there is no change in momentum.

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)