The truck has more m v because mass is bigger.
Impulse is force times time. There are no external forces on this system. Therefore the force of the truck on the car is equal and opposite to that of the car on the truck. The time is the same. Thus equal but opposite impulse.
A car of mass M, traveling at speed v collides head-on with a truck of mass 2M & traveling in the opposite direction at the same speed. Both vehicles lock together and come to a stop. Which, if either, has the most momentum upon impact? Which, if either, undergoes the greatest impulse? Explain.
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