First of all, thanks to anyone who takes a stab at this.
I am pulling my hair out with my project and my professor hasn't been any help.
I am trying to solve two differential equations simultaneously to get a function for two variables, x and y. I will post the whole notebook below to see if anyone can help with the dvnoarg error I am getting.
I really appreciate anyone who takes the time to look at this.
Attachment: Pendulum spring.nb, URL: ,