A lorry weighing 10t moving at 5 m/s crashes into a car moving at 8 m/s. The lorry creashes into the car and the duration is 20 m/s. What force acts on the car, if the speed of the car after collision is 10m/s.

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The car experienced an acceleration of 100 m/s^2 during the 20 millisecond collision. That is, the change in velocity in a very short time, produce a large acceleration, a= 10m/s-8m/s divided by 20 ms., equal 100m/s^2. Force is equal mass time acceleration. The force that acted on the car was the mass of the lorry 10,000kg time the acceleration, equal 10^6 N. One million Newtons.