Collision of two identical cars moving in opposite dirrections

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In a collision between two identical cars moving in opposite directions, the injuries to passengers depend on the kinetic energy involved in the crash. If both collisions—against a brick wall and with another identical car—result in the same kinetic energy loss, the impact forces experienced by passengers would be similar. Analyzing the reference frames reveals that in a stationary frame, the cars come to a complete stop, while in a moving frame, they decelerate to half their speed. The forces experienced by passengers in both scenarios are effectively the same, leading to comparable injury outcomes. Thus, the nature of the collision does not significantly alter the potential for injury if kinetic energy loss is consistent.
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What would cause more injuries to the passengers of each car? [no a pleasant example, I know]
a) car colliding against brick wall.
b) car colliding with an identical car moving in the opposite direction at the same speed.

Does it have something to do with the amount of K.E liberated / lost?
 
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If the amount of kinetic energy lost in both cases is the same (like if it's completely elastic or completely inelastic, for example) then choices A and B are the same. You should also assume the cars are the same mass, there isn't much damage to a semi when it hits a sub-compact.

One of the ways to think about this problem is that in a reference frame at rest you slow down from your initial speed to zero. And in a reference frame moving with one of the cars, you slow down from your initial speed to half of your initial speed. The force you experience in each case is the same.
 

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