Question

law of conservation of momentum
In the absence of an external force the total momentum of a system is a constant
write the name of the law related to this phenomenon​

Answer 1

In equation form, the conservation of momentum principle for an isolated system is written ptot = constant, or ptot = p′tot, where ptot is the total momentum (the sum of the momenta of the individual objects in the system) and p′tot is the total momentum some time later.