You need to separate whiplash from concussions. Whiplash can manifest symptoms that are the same as a concussion.

Trips are usually whiplash events.

My daughter suffered a concussion without hitting her head in a car collision. Her Toyota 4x4 pickup was taco'ed with a bent frame.

Her sternum and rib cage was also taco'ed. Broken ribs and sternum and a good case of whiplash and a concussion. Her seat belt snagged her real hard.

Your neck and spine and maybe chest will be traumatized if the deceleration is enough to cause a concussion.