WHO CARES!!


"HotRod" wrote in message
...
The answer is "A". 100 mph, because

E1=E2 when two cars hit head on which means each car would absorb 50 kmh
of
kinetic energy BUT when a car hits a wall
E1 is divided in 1/2, 1/2 going to the wall and 1/2 to the car. It's all
in
the wording of the question