The car was shifted into park at 11 mph??
It could ruin the transmission..... rough on the car for sure..
Shifting like that doesn't actually put the brakes on , it is using the transmission to stall/stop a car..unless the person driving hits the brakes also..

Most likely some neck & soft tissue affected, due to the seatbelt & jerking.
Treat for sore muscles and see how it goes..