Can you suggest a project in physics that is investigatory and easy to do. :)

What are the physics topics that you do at school? You may look into one of the topics you like in a more in depth manner during your project. And, that should also be within your reach.

In 11th grade I had this project about "Stars". It was very cool and interesting subject and I did very well. I would suggest you taking a project in which you are curious and in which you can find more stuff in the internet (like video clips and experiments), but the main issue is something you are interested in.

Do a study that shows why an atom-bomb is a necessary part of an H-Bomb. This is so because only the Atom Bomb can create the tremendous heat necessary to fuse Hydrogen Isotopes to create Helium, which has a much higher Binding Energy.