Do you mean the Fkinetic? μk is the constant of kinetic friction, not the force of kinetic friction. If you mean the force of the kinetic friction, then the answer is yes. If an object is on a flat surface moving at a constant velocity then by definition there is no acceleration, which means the forces are in equilibrium and the force being applied to it in the horizontal direction must be exactly equal to the force being exerted by the kinetic friction.
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Do you mean the Fkinetic? μk is the constant of kinetic friction, not the force of kinetic friction. If you mean the force of the kinetic friction, then the answer is yes. If an object is on a flat surface moving at a constant velocity then by definition there is no acceleration, which means the forces are in equilibrium and the force being applied to it in the horizontal direction must be exactly equal to the force being exerted by the kinetic friction.