in this condition: Mass 1 = 2.5 kg and v =25 m/s Mass 2 = 4.0 kg and v = - 10 m/s and how it produces conservation of momentum??? and, find the percentage of energy lost in the collision. which cart will lose more energy and why? heeellpppppppppp!!!! i know that the inital and final momentums are equal, but i don't know the rest!! thanks in advance!