Units incorrectly converting to lb/s^2?

[TN_9481700]

Zip file is attached. 

I was working some simple calculations and I could not get the units for "fiu" to come out correctly. 

Since this is for a spring, the units should be "lb/in". But instead, MathCAD keeps populating with "lb/s^2". 

I have re-worked it several times and still get the same incorrect units in MathCAD. 

Not sure what I am doing wrong?

Your help is appreciated! 

[Fred_Kohlhepp · Accepted solution]

lb is a Mathcad unit of mass (like kg)

lbf is "one pound force"

[TN_9481700]

Wow. Thank you. Can't believe I missed that. 

I appreciate the prompt response. 

[ChrisKaswer]

Your formulas are working perfectly...you just need to ask for "lbf/in" and you will get 10483.126 as the numeric value. The unit "lb" is for mass and "lbf" represents force.

Cheers