There are two phases in JEE Examination i.e., JEE Main and JEE Advanced. As the competition is very tough among students therefore they can’t miss any single topic of any subject in JEE Examination. But it is very difficult to revise the complete theory just before the examination. To help students we bring the complete notes of chapter Centre of Mass including topics like centre of mass of two points system, centre of mass of n points system, impulse, thrust etc. About 1-2 questions are being asked from this chapter. This article talks about important formulae and previous year questions related to Centre of Mass. The concept given in this article is in concise form and can be used for revision before the examination. Some questions are given in the article which have been asked in the previous year engineering entrance exams.