at a speed of 30 mi/hr, the car crashes head on into a brick wall. despite the fact that the car crunched to a total stop, one of NEWTON'S laws predicts that you will continue to fly forward at 30 mi/hr until you collide with the windshield or dash. WHICH LAW?
The law you are referring to is Newton's First Law of Motion, also known as the law of inertia. This law states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity unless acted upon by an external force.
In this scenario, the car is traveling at a speed of 30 mi/hr before crashing into the brick wall. When the car collides with the wall, it experiences a sudden stop due to the force exerted by the impact. However, according to Newton's First Law, because of the car's inertia, your body will continue to move forward at the same velocity it had before the collision until acted upon by another force.
In this case, the force that stops your forward motion is typically provided by the windshield or dash of the car. Without any restraint, such as a seatbelt, you would indeed continue moving forward at the same speed until encountering an object that exerts a force on your body, like the windshield or dash. This is why it is important to wear seatbelts while in a moving vehicle, as they help restrain your body and prevent injury during sudden stops or collisions.