EPQ artefact duel accreditation?

I've just started my summer research for my EPQ. I'm planning on designing and building a trebuchet and I was going to use A level physics knowledge to calculate projectile motions and such. Even though that is only a small part of my whole project, would i be disqualified for using A level specification calculations or would I be alright only if I included more advanced stuff I don't understand at the moment?

What guidance did your school give?

They haven't really helped at all

You shouldn't start before you understand the requirements.

Well they want us to have finished all research before start of yr 13 and obv I can't email the teachers now so that's why I've come here?