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Yes, all things being equal, crash severity does increase proportional to the speed of each vehicle at impact, and is a vector sum. So, there is a big difference between crash severity at impact from being "rear-ended" (when one vehicle is traveling the same direction as another, and impacts the front of their vehicle with the rear of another) and a "head-on" impact (two cars traveling into one another, impacting both front bumpers).
In the rear-end impact, you take the momentum (mass times velocity) of the rear, impacting vehicle "A" and subtract the momentum of the front-most impacted vehicle "B", and that gives you the resultant impact force (the difference in momentum being transferred).
weak impact scenario example: vehicle A is traveling 60 mph, and vehicle B is the same mass and is traveling 50 mph. The difference in momentum would be the mass times 10 mph...not much.
severe impact scenario: vehicle A is traveling 70 mph, and vehicle B is at rest (0 mph)...large impact.
In the head-on impact, you have the most severe crash scenario. In this case, you ADD the momentum of vehicle A with the momentum of vehicle B, and you get the resultant force of impact.
Even if both vehicles are traveling 30 mph, with the same mass, and have a heaad-on collision, the is close to the same as one vehicle traveling 10 mph and hitting the other vehicle going 70 mph...severe impact.
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In a 15 mph crash without a seatbelt, the crash test dummy would experience the full force of the impact which could result in injuries such as head trauma, whiplash, or broken bones. Without the seatbelt to restrain the dummy's movement, it may also be thrown forward or out of the vehicle, increasing the risk of serious harm or death.
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Surviving a 75mph bike crash without breaking a bone and without wearing a helmet would be extremely unlikely due to the high velocity and impact forces involved. It would largely depend on various factors like body position, angle of impact, and the surface of the crash, which could potentially reduce the severity of injuries. However, wearing a helmet significantly reduces the risk of head injuries in such accidents.
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Is a meteorite crash considered a natural disaster?
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