The last trolley accident I was in (a good number of years ago), it took us longer to go from 20 to 0. Young lady thought she could run a red light in front of the train. Yes, it is possible to go into shock, even if you have no injuries. Of the trolley passengers, naught more than minor bumps.
On the other hand...
At the age of 15 I saw a film on traffic accidents in health and safety class. At the very end they showed the location where an old Model A Ford had crashed, and the passenger (a teen girl) was catapulted through the air. Coming down she was decapitated by a guywire. Car was going twenty miles an hour.
Lesson?
Even a minor accident can be deadly.