How do I physic car

i wonder if we can make a physic car Vs Car racing with physic and change Velocity etc etc any post or tutorial about this?

or other trick with no physic..

example:

A REd car with 100 speed run X 0- 500 and blue Car with 100 speed run from X 500-0 this car (in X 250)we have crash so we make a Frontal Collision .

or if blue car is stoped and red car run and crash with blue car we have both bounch etc etc.. max speed max bounch, litle speed just push the other car..

sorry for im not explain exactly im not good with English..:/

I am not 100% sure of what you are after. I can only guess you want to create a physics based car game?

If that is the case here are a few links that might help out:

https://www.scirra.com/tutorials/323/create-car-physics

behavior-car-physics_t69925

physics-based-car-driving_t123462