When you jump out of the car, you’re traveling the same speed the car was. And you don’t slow down meaningfully on your way down, so you touch the ground at very high speed.
The ground, typically, is hard, rough, and full of pointy sharp objects, all of which you hit at whatever the speed of your car was. That creates more than enough friction to rip your skin off, and the uneven force on your body can send you tumbling with enough force to break your bones and cause massive internal injury.
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