Newtons Law postulates that an object at rest *or at rest* will continue to remain at rest or uniform motion unless acted upon by an exterior force.
What this means is that if there is no (net) force acting on an object, then it’s speed won’t change, not that it won’t move.
If it’s already moving, then it’s speed will stay constant, and if it’s not moving it will equally stay constant (in this case at zero)
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