Describe a situation in which the net external force on a

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        If the net external force acting on a system is non-zero quantity, the system moves with a constant speed. We are going to show the same as mentioned.

Consider a box lying on a table and it has a mass m. The internal forces acting on the system are the weight of the box and the normal force acting perpendicular. The weight of the box and normal force assumed to cancel each other and the net internal force is zero and the body remains in the rest state.