noun, noun which may take the genitive case particle 'no'
ballistics
The scientific study of the motion, behavior, and effects of projectiles, especially bullets and artillery shells. Used as a noun or with の to modify another noun.
彼は大学で弾道学を専攻している。
He is majoring in ballistics at university.
弾道学の知識は犯罪
Knowledge of ballistics is useful in criminal investigations.