Is there a way to check the speed at which the car hit a solid object?
There is a 'compare speed' condition for the car behavior.
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I didn't know of this, but how could this help me with getting the speed of the car when it hits a solid object?
You should be able to just get the speed in an 'on collision' event. However, I just tried it and it seems there's a bug - car's speed expression is not working. I've fixed it for the next build.