A body remains in equilibrium if ________
(a) Inertia force is applied in the same direction to the resultant force
(b) Inertia force is applied in the direction opposite to the resultant force
(c) Inertia force is applied in the direction Perpendicular to the resultant force
(d) Inertia force is applied in the direction Parallel to the resultant force
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I'm obligated to ask this question of Resultant Effect of a System of Forces Acting on a Rigid Body in portion Inertia Forces in Reciprocating Parts of Machine Dynamics