The sum of all the external forces on a system of particles is zero therefore the following which must be true of the system is that the total linear momentum is constant and is therefore denoted as option D.
This is referred to as the vector quantity and is known as the product of the mass of an object, m, and its velocity, v.
In a scenario where the sum of all the external forces on a system of particles is zero, then it means that the total total linear momentum is constant which is necessary to keep it in equilibrium.
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