If a car goes a speed of 85 miles per hour, how far would it launch you if you didn't have your seatbelt on?
You need to specify decceleration. Insufficient information.See below.
If the car was at 85 miles/hr, and hit something to stop in a time t sec, you would get launched, the distance depending on your weight and the time t secs.
This is an application of Netwon's Law
So the question is how fast did the car stop and what is your weight.