JayUtah
Penultimate Amazing
Correct. It doesn't matter what circumstances led to the collision. You can imagine that the distracted driver suddenly braked from 15 m/s to 10 m/s, but the kinetic energy at the moment of collision is still proportional to 50 m, where m is the mass of the car. You can imagine that the car with the failed brakes was driving through vacuum or a sea of molasses. But I told you that the velocity of the car was 10 m/s at the point of collision. That means its kinetic energy is exactly the same as that of the other car. Kinetic energy is the determinative factor in collision mechanics.But ceteris paribus the end result is the same.
Now imagine that I suspend a car from its rear axle a certain distance above the ground and drop it onto a concrete slab such that it hits the ground at 10 m/s. Would that result in comparable initial collision mechanics? Why or why not?
For extra credit, tell me how high the front bumper of the car would have to be off the ground in order for it to land with a velocity of 10 m/s, assuming there's no fluid resistance. This is a first-year physics question, or you can probably cheat and ask an AI.
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