Hi!

I am trying to perform a drop test where a hollow box is dropped from 72in onto the corner of the surface. I would like to know the acceleration the inside of the box sees during the impact. I believe I have modeled this correctly, but when I try to create a time vs. acceleration plot for  one of the notes, I get an uneven graph with an astronomical number for the max acceleration (about 10,000G). Have I modeled this incorrectly for my purpose? Any help is appreciated! The graph is pasted below and the part is attached.