Question

what is law of conservation of linear momentum

Answer 1

conservation of linear momentum expresses the fact that a body or system of bodies in motion retains its total momentum the product of mass and vector velocity, unless an external force is applied to it. 

Answer 2

Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge. In particle physics, other conservation laws apply to properties of subatomic particles that are invariant during interactions. An important function of conservation laws is that they make it possible to predict the macroscopic behaviour of a system without having to consider the microscopic details of the course of a physical process or chemical reaction.

HOPE IT IS HELPFUL FOR YOU
PLEASE MARK AS BRAINLIST