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Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that exerted on the truck. To substantiate this view, they point out that the car is crushed, whereas the truck is only dented. This idea of unequal forces, of course, is false;
| force on truck driver | N |
| force on car driver | N |
Given that the drivers of equal masses(m=73kg) are moving with opposite velocities, one in 800kg and other in 4000kg, so the total initial momentum of the system if car moves in positive x direction and truck in negative x direction is
After collision both car and truck move with same velocity this gives the final momentum as as,
Since momentum has to be conserved, so (1)=(2) which gives the final velocity after collision of both car and truck as,
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