Not sure what you mean by this:
> pushed from the back with rapid acceleration, or absorbing the energy of a collision.
The occupants don't have to absorb the impact if the crumple zones take it!
I guess decent seats will do a lot to protect the occupants. A few years back I was a rear-seat-passenger in one of these https://upload.wikimedia.org/wikipedia/commons/5/50/Nissan_M... when it was rear-ended. Luckily our driver WAS on the brake and didn't go forward into the cars in front - unlike the car behind us and the car behind them and the car behind them! (I forget exactly how many cars were involved but it needn't have been as many).
Not sure what you mean by this: > pushed from the back with rapid acceleration, or absorbing the energy of a collision. The occupants don't have to absorb the impact if the crumple zones take it!
I guess decent seats will do a lot to protect the occupants. A few years back I was a rear-seat-passenger in one of these https://upload.wikimedia.org/wikipedia/commons/5/50/Nissan_M... when it was rear-ended. Luckily our driver WAS on the brake and didn't go forward into the cars in front - unlike the car behind us and the car behind them and the car behind them! (I forget exactly how many cars were involved but it needn't have been as many).