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 P: 8 It gets better. Thanks. Energy absorbed by car equals its kinetic energy (assuming head-on collision and that both cars stop after), so work done by average force on the car is $F_{aver}d = -\frac{1}{2}mv^2$ where d is the deformation of the car. From 2nd Newton's law the average force is equal to $F_{aver} = m\frac{\Delta v}{\Delta t}$ Are these 2 average forces the same?