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Ah that makes sense, thank you!

By setting Ein to Eout and making the equation Us = Wf why doesn't that imply conservation of energy? I always thought you had to include an E loss to the equation as well to show that the mechanical energy wasn't conserved. Where did the Eloss go in this case?

I don't know why the images didn't load the first time but hopefully you can see this:

Here are the files (white is answer key):

I first attempted to do Ein = Eloss + Eout because the equation had friction in it but in the answer key they set it as the energy was conserved by doing Ein = Eout, why is it conserved when the puck comes to a stop which means energy was lost? I thought the equation should have been Uspring =...