In addition to only thinking about the forces it would be helpful to think about the exchange between kinetic and potential energy. By only using energy conservation you can for example make a statement about the velocity you'll have when you emerge on the other side of the earth.
Harry Potter is great :) If you're done with the books and still cannot get enough of it I can suggest a great fanfiction called "Harry Potter and the methods of rationality"
You'll easialy find it on google.
Hi everyone! This is my first post on this forum and I'll use it to introduce myself.
Im 22 years old and live in Switzerland. My native language is german and I appologize once right now for possible language mistakes in my future posts. I'm sure you will simply ask me back if something isn't...