Hi All

I enjoyed posts of reaction time calculations & simulations of stopping distance.  My question is:  Two cars drive along.  The front one at 100km/h. He gets hit from behind by a car with speed far exceeding that of the front car.  The brake marks of the car behind measure 65m.  Can we somehow calculate/estimate the speed of the rear car at the point of of impact and at point where he started braking?  Both cars where average size family cars (max 5 persons) only 1 person in rear car.  Had ABS brakes.  Tyres in very good condition. How much impact would road & air temperature as well as tyre temperature have on the result?

Kind regards!