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Law of conservation of motion states that when there is no net external force acting on an isolated system of bodies, the total linear momentum of all the bodies is a constant.

p = m1u1 + m2 u2 + m3 u3 + ...  =  m1 v1 + m2 v2 + m3 v3 + ....

Where m is mass, u is initial velocity at t = 0 and v is velocity at a time t for the bodies.