Hi friends, I have an issue in solving a Collision of multiple particles. Please Help me in solving this. Thank you all in advance. The problem is as: https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-frc3/q71/s720x720/1395304_1432383000322139_406785433_n.jpg Attempt: https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-prn2/q81/s720x720/1380665_1432380623655710_1216390070_n.jpg Friends according to me the answer should be e = 1, which is not any option and question says answer is 2/3 which is Option (a). Please try to help me in this. I will appreciate the help.