@Chirag_Hegde If you need link, I can paste it here.
BTW, I solve questions from various sources for every topic and for the best sources, I repeat them number of times. Like, I solved, DC Pandey, BM Sharma, HC Verma, Pinksy, Resnick Helliday, Irodov & Krotov for COM & Collisions but I liked BM Sharma and HC Verma's question very much. So, I solved them twice. This is how i do it.