Let's say the car was moving at about 35-40 miles per hour (55-65 kph), and Character T is a healthy and physically fit 16 year old. He jumps out and lands on his front. How bad would the injuries be, could he get up and walk or run? I doubt it myself, but I tried searching the internet and found nothing helpful.
EDIT: Sorry, I'll be more specific. He lands on his hands and knees. I'm pretty sure that would break something, but as to the severity I don't know.