Find Coefficient of Friction for Physics Final Review

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To find the coefficient of friction for the brick, use the equation coefficient = friction force / normal force. Given that a force of 5.4 N is needed to move the brick at a constant velocity, this force represents the friction force. The normal force can be calculated from the mass of the brick, which is 1.2 kilograms, resulting in a normal force of approximately 11.76 N (mass times gravity). Therefore, the coefficient of kinetic friction can be calculated as 5.4 N divided by 11.76 N, yielding a value of about 0.46. This approach effectively applies Newton's Second Law by recognizing that the total forces are zero when moving at constant velocity.
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I'm doing a review for my physics final, and it's asking me to find the coefficient. The problem says,

A brick has a mass of 1,2 kilograms. A force of 5.4 N is required to move the brick across the floor with a constant velocity. What is the coefficient of friction?

What is the equation I use to solve this?
 
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Try and use Newton's Second Law.
 
I'm assuming this is coefficient of kinetic friction?

coefficient = Friction force / Normal forceAnd when you move at constant velocity, total forces on said object = 0, so can you figure it out from there?
 

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