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## Homework Statement

You use 30N (**Not 25 N, that was a typo) to slide a wooden box that is 12 kg across a floor at constant velocity. What is the coefficient of kinetic fricition?

## Homework Equations

Ff=coeff of kinetic friction (mu k) m*g

?? not sure.

## The Attempt at a Solution

coeff of kinetic friction=12 kg/30N=.4.

That answer is obviously incorrect, but I don't know what to do.

Thanks in advance.

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