User Portlet User Portlet

Discussions
Hi, I am facing troubles to solve the following 2nd order ordinary differential equation {x'[t] == v[t], v'[t] == 0.4 Sign[v[t]] UnitBox[v[t], x[t]] - 0.1 v[t] - x[t]} Apparently, this is a nonlinear ODE, moreover, it contains a...