Is kinetic energy of a system conserved when two objects collide and stick together? What about the momentum of the system? What kind of collision is this (elastic or inelastic )? A ssume that a cement truck with a mass of 10,000 kg hits you while you were stopped at a traffic light, and that you are driving a Yugo with a mass of 750 kg. If the truck was traveling at 15 mph and the crash makes you stick together (you and the truck have the same final velocity), what is your final velocity? Ignore friction with the road.