Question

multiple choice question
if the net force acting on an object is zero, then
o the object forms an isolated system.
o the object is not subject to newtons laws.
o the object is inertia - free.
o the object is in equilibrium.
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Explanation:

According to Newton's first law, when the net force acting on an object is zero, the object is in equilibrium. An object in equilibrium has no acceleration. The other options are incorrect. There is no such thing as an "inertia - free" object (inertia is an inherent property of matter). If the net force is zero, the object is subject to Newton's laws (specifically the first law). And just because the net force is zero doesn't mean the object forms an isolated system (an isolated system has no external forces or matter exchange, but here we are only talking about force balance).

Answer:

the object is in equilibrium.