https://www.vtomb.com/video/R5_sfvFhcuI&list=PLF_7kfnwLFCGAL8XxoX2I8SjMXMtc07Yt&index=5/class-11-chapter-7-system-of-particles-centre-of-mass-05-conservation-of-linear-momentum-iit-jee-video