What was the driver’s acceleration during the collision?

A car traveling at 90 km/hr strikes a tree. The front end of the car compresses and the driver comes at rest after traveling 0.8 m.
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1 Answer

v^2-u^2=2as where v=final speed, u=initial speed, a=acceleration, s=distance.

We have v=0 (car stops), u=90kph=90000m/h=25m/s, s=0.8m.

-625=1.6a. So a=-390.625m/s/s (deceleration).
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