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I'm in the middle of a problem on the online program Webassign, trying to calculate the coefficient of friction in a problem. I have the correct value of the force of friction, and I believe I have the correct Normal Force value, but the program is rejecting my answer.

The problem involved a 21kg box sliding down a 38 degree inclined plane at an acceleration .270 m/s^2, and I calculated the force of friction to be 121.033N. To solve for the coefficient of friction I am using the equation Ff=uFn → u=Ff/Fn= 121.033N/205.8N=.588

Did I make an error or is it a glitch in the program?

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# Homework Help: Calculation Error?

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