Dick Fuller, that’s right about the units! Good catch. But concerning the momentum after the collision, there will be a momentary resultant momentum vector that has to do with the sums of the two vectors; that is why the cars might bounce back, or in the case of the picture the truck bounced over, because the collision changed the vectors of both cars. But like you said the momentum will eventually dissipate from the force the ground exerts on the car.
Dan, I could see this application being used in crash investigations because I do know they investigate velocity vectors of the cars, but that’s just a conjecture.

]]>