https://www.vtomb.com/video/zdPLAWmBN9U&index=6&list=PLF_7kfnwLFCGAL8XxoX2I8SjMXMtc07Yt/class-11-chapter-7-centre-of-mass-06-conservation-of-momentum-in-bomb-shell-explosion-iit-jee-video