What would the G-force be in a T-bone crash?

I have a question. I would like to know what speed/G-force would be if a 20,000 pound box truck T-boned a 5000 lb. truck. The truck was moved approxomztley 97 feet, the box truck flipped on it’s side(possible because it hit the curb of a grass median). The truck was totalled and the cab was in a “v” shape, cab was moved around 1 1/2 to 2 feet from the bed(torward the passenger side), roof and hood were crimpled. The driver of the box truck stated he was going 45 mph, hit the said truck, flipped and hit another truck that stated they were going 40 mph ahead of the accident.

Could someone pleawse help me with this. My wife was in the truck that was T-boned and just want to know mainly the speed of the box truck. Note, the box truck did noit apply the brakes, there were no shid marks except the truck that was hit as it slid acroos the grass median.