Author here. I've been working on a lot of things (exercises, phys.js simulations, new free tutorials) and planning a bit launch, but now I realize that the fa

Author here. I've been working on a lot of things (exercises, phys.js simulations, new free tutorials) and planning a bit launch, but now I realize that the fall semester is almost over so I decided to launch v4.0 ASAP. Maybe my book will help some students who are freaking out about their upcoming calculus and mechanics finals!