Q ) A 5 kg mass traveling at 6 1 strikes a stationary 3 kg mass off- center ( not head- on). After the collision the 3 Kg piece travels at 5 wx at an angle of 60 degrees from the original velocity . Using momentum conservation determine the speed of the 5 kg after the collision Cit moves at angle of 30 degrees from the original velocity as shown ) ( there is two way to do this because the momentum is conserved in both ) Is the collision elastic ? prove it. (before) after 6.0m'S 30 5 kg 60 $ 5.0 m/S